chore: bump v0.1.53 — sidebar section positioning and scrollable maxHeight

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
feat: position Routes and Starred sections at bottom of sidebar
2026-04-15 21:04:55 +02:00 · 2026-04-15 21:01:29 +02:00 · 2026-04-15 21:00:17 +02:00 · 2026-04-15 20:57:43 +02:00 · 2026-04-15 20:56:03 +02:00 · 2026-04-15 20:53:53 +02:00
7 changed files with 995 additions and 4 deletions
--- a/docs/superpowers/plans/2026-04-15-sidebar-section-layout.md
+++ b/docs/superpowers/plans/2026-04-15-sidebar-section-layout.md
@@ -0,0 +1,541 @@
+# Sidebar Section Layout Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add `position` and `maxHeight` props to `Sidebar.Section` so sections can stack at the top or bottom of the sidebar with optional scrollable content areas, and style all scrollbars to match the dark sidebar aesthetic.
+
+**Architecture:** Extend the existing flexbox column layout inside `SidebarRoot` by partitioning section children into top/bottom groups with a flex spacer between them. Each group wrapper scrolls independently when the viewport is short. `SidebarSection` gets a content wrapper div that accepts an inline `maxHeight` and scrolls its children. Custom thin scrollbar styles are applied via CSS.
+
+**Tech Stack:** React, CSS Modules, Vitest + React Testing Library
+
+---
+
+## File Structure
+
+| File | Action | Responsibility |
+|------|--------|----------------|
+| `src/design-system/layout/Sidebar/Sidebar.tsx` | Modify | Add `position` and `maxHeight` props to `SidebarSectionProps`, wrap children in `.sectionContent` div, partition children in `SidebarRoot` into top/bottom groups |
+| `src/design-system/layout/Sidebar/Sidebar.module.css` | Modify | Add `.sectionGroup`, `.sectionSpacer`, `.sectionContent` classes, custom scrollbar styles |
+| `src/design-system/layout/Sidebar/Sidebar.test.tsx` | Modify | Add tests for position partitioning, maxHeight content wrapper, spacer rendering, collapsed behavior |
+
+---
+
+### Task 1: Add CSS classes for section groups, spacer, content wrapper, and scrollbars
+
+**Files:**
+- Modify: `src/design-system/layout/Sidebar/Sidebar.module.css:392` (before the bottom links section)
+
+- [ ] **Step 1: Add `.sectionGroup`, `.sectionSpacer`, `.sectionContent`, and scrollbar styles**
+
+Insert the following block before the `/* ── Bottom links */` comment at line 392:
+
+```css
+/* ── Section groups (top/bottom positioning) ───────────────────────────── */
+
+.sectionGroup {
+  flex: 0 1 auto;
+  overflow-y: auto;
+  min-height: 0;
+  scrollbar-width: thin;
+  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
+}
+
+.sectionGroup::-webkit-scrollbar {
+  width: 4px;
+}
+
+.sectionGroup::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.sectionGroup::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.15);
+  border-radius: 2px;
+}
+
+.sectionGroup::-webkit-scrollbar-thumb:hover {
+  background: rgba(255, 255, 255, 0.3);
+}
+
+.sectionSpacer {
+  flex: 1 0 0;
+}
+
+/* ── Section content (scrollable maxHeight) ────────────────────────────── */
+
+.sectionContent {
+  overflow-y: auto;
+  scrollbar-width: thin;
+  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
+}
+
+.sectionContent::-webkit-scrollbar {
+  width: 4px;
+}
+
+.sectionContent::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.sectionContent::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.15);
+  border-radius: 2px;
+}
+
+.sectionContent::-webkit-scrollbar-thumb:hover {
+  background: rgba(255, 255, 255, 0.3);
+}
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add src/design-system/layout/Sidebar/Sidebar.module.css
+git commit -m "style: add section group, spacer, content, and scrollbar CSS classes"
+```
+
+---
+
+### Task 2: Add `maxHeight` prop and content wrapper to `SidebarSection`
+
+**Files:**
+- Modify: `src/design-system/layout/Sidebar/Sidebar.tsx:21-29` (SidebarSectionProps)
+- Modify: `src/design-system/layout/Sidebar/Sidebar.tsx:78-131` (SidebarSection component)
+- Test: `src/design-system/layout/Sidebar/Sidebar.test.tsx`
+
+- [ ] **Step 1: Write the failing tests**
+
+Add the following tests to the end of the `describe` block in `Sidebar.test.tsx`:
+
+```tsx
+// 17. renders sectionContent wrapper with maxHeight when open
+it('renders section content wrapper with maxHeight style when open', () => {
+  const { container } = render(
+    <Wrapper>
+      <Sidebar>
+        <Sidebar.Section
+          icon={<span>ic</span>}
+          label="Apps"
+          open
+          onToggle={vi.fn()}
+          maxHeight="200px"
+        >
+          <div>child</div>
+        </Sidebar.Section>
+      </Sidebar>
+    </Wrapper>,
+  )
+
+  const contentWrapper = container.querySelector('.sectionContent')
+  expect(contentWrapper).toBeInTheDocument()
+  expect(contentWrapper).toHaveStyle({ maxHeight: '200px' })
+  expect(screen.getByText('child')).toBeInTheDocument()
+})
+
+// 18. renders sectionContent wrapper without maxHeight when not provided
+it('renders section content wrapper without inline maxHeight when maxHeight is not provided', () => {
+  const { container } = render(
+    <Wrapper>
+      <Sidebar>
+        <Sidebar.Section
+          icon={<span>ic</span>}
+          label="Apps"
+          open
+          onToggle={vi.fn()}
+        >
+          <div>child</div>
+        </Sidebar.Section>
+      </Sidebar>
+    </Wrapper>,
+  )
+
+  const contentWrapper = container.querySelector('.sectionContent')
+  expect(contentWrapper).toBeInTheDocument()
+  expect(contentWrapper).not.toHaveStyle({ maxHeight: '200px' })
+  expect(screen.getByText('child')).toBeInTheDocument()
+})
+
+// 19. does not render sectionContent wrapper when section is closed
+it('does not render section content wrapper when section is closed', () => {
+  const { container } = render(
+    <Wrapper>
+      <Sidebar>
+        <Sidebar.Section
+          icon={<span>ic</span>}
+          label="Apps"
+          open={false}
+          onToggle={vi.fn()}
+          maxHeight="200px"
+        >
+          <div>child</div>
+        </Sidebar.Section>
+      </Sidebar>
+    </Wrapper>,
+  )
+
+  const contentWrapper = container.querySelector('.sectionContent')
+  expect(contentWrapper).not.toBeInTheDocument()
+})
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `npx vitest run src/design-system/layout/Sidebar/Sidebar.test.tsx`
+Expected: FAIL — `maxHeight` prop is not recognized, no `.sectionContent` wrapper exists.
+
+- [ ] **Step 3: Add `position` and `maxHeight` to `SidebarSectionProps`**
+
+Update the interface at line 21:
+
+```tsx
+interface SidebarSectionProps {
+  icon: ReactNode
+  label: string
+  open: boolean
+  onToggle: () => void
+  active?: boolean
+  children: ReactNode
+  className?: string
+  position?: 'top' | 'bottom'
+  maxHeight?: string
+}
+```
+
+- [ ] **Step 4: Update `SidebarSection` to destructure new props and wrap children**
+
+Update the function signature at line 78 to destructure the new props (they are accepted but `position` is only used by `SidebarRoot`):
+
+```tsx
+function SidebarSection({
+  icon,
+  label,
+  open,
+  onToggle,
+  active,
+  children,
+  className,
+  position: _position,
+  maxHeight,
+}: SidebarSectionProps) {
+```
+
+Then replace `{open && children}` (line 128) with:
+
+```tsx
+{open && (
+  <div
+    className={styles.sectionContent}
+    style={maxHeight ? { maxHeight } : undefined}
+  >
+    {children}
+  </div>
+)}
+```
+
+- [ ] **Step 5: Run tests to verify they pass**
+
+Run: `npx vitest run src/design-system/layout/Sidebar/Sidebar.test.tsx`
+Expected: ALL PASS
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/design-system/layout/Sidebar/Sidebar.tsx src/design-system/layout/Sidebar/Sidebar.test.tsx
+git commit -m "feat: add maxHeight prop with sectionContent wrapper to SidebarSection"
+```
+
+---
+
+### Task 3: Partition children in `SidebarRoot` into top/bottom groups
+
+**Files:**
+- Modify: `src/design-system/layout/Sidebar/Sidebar.tsx:167-244` (SidebarRoot component)
+- Test: `src/design-system/layout/Sidebar/Sidebar.test.tsx`
+
+- [ ] **Step 1: Write the failing tests**
+
+Add the following tests to the end of the `describe` block in `Sidebar.test.tsx`:
+
+```tsx
+// 20. renders top sections in sectionGroup wrapper
+it('renders sections in top group wrapper by default', () => {
+  const { container } = render(
+    <Wrapper>
+      <Sidebar>
+        <Sidebar.Section icon={<span>ic</span>} label="Apps" open onToggle={vi.fn()}>
+          <div>apps content</div>
+        </Sidebar.Section>
+      </Sidebar>
+    </Wrapper>,
+  )
+
+  const topGroup = container.querySelector('.sectionGroup')
+  expect(topGroup).toBeInTheDocument()
+  expect(topGroup!.textContent).toContain('Apps')
+})
+
+// 21. renders bottom sections in separate group with spacer
+it('renders bottom sections in a separate group with spacer between', () => {
+  const { container } = render(
+    <Wrapper>
+      <Sidebar>
+        <Sidebar.Section icon={<span>ic</span>} label="Apps" open onToggle={vi.fn()}>
+          <div>apps content</div>
+        </Sidebar.Section>
+        <Sidebar.Section icon={<span>ic</span>} label="Routes" open onToggle={vi.fn()} position="bottom">
+          <div>routes content</div>
+        </Sidebar.Section>
+      </Sidebar>
+    </Wrapper>,
+  )
+
+  const groups = container.querySelectorAll('.sectionGroup')
+  expect(groups).toHaveLength(2)
+  expect(groups[0].textContent).toContain('Apps')
+  expect(groups[1].textContent).toContain('Routes')
+
+  const spacer = container.querySelector('.sectionSpacer')
+  expect(spacer).toBeInTheDocument()
+})
+
+// 22. does not render spacer when no bottom sections
+it('does not render spacer when all sections are top', () => {
+  const { container } = render(
+    <Wrapper>
+      <Sidebar>
+        <Sidebar.Section icon={<span>ic</span>} label="Apps" open onToggle={vi.fn()}>
+          <div>apps content</div>
+        </Sidebar.Section>
+        <Sidebar.Section icon={<span>ic</span>} label="Agents" open onToggle={vi.fn()}>
+          <div>agents content</div>
+        </Sidebar.Section>
+      </Sidebar>
+    </Wrapper>,
+  )
+
+  const spacer = container.querySelector('.sectionSpacer')
+  expect(spacer).not.toBeInTheDocument()
+})
+
+// 23. collapsed sidebar renders bottom sections in bottom group
+it('renders bottom sections in bottom group when sidebar is collapsed', () => {
+  const { container } = render(
+    <Wrapper>
+      <Sidebar collapsed onCollapseToggle={vi.fn()}>
+        <Sidebar.Section icon={<span>ic</span>} label="Apps" open={false} onToggle={vi.fn()}>
+          <div>apps</div>
+        </Sidebar.Section>
+        <Sidebar.Section icon={<span>ic</span>} label="Routes" open={false} onToggle={vi.fn()} position="bottom">
+          <div>routes</div>
+        </Sidebar.Section>
+      </Sidebar>
+    </Wrapper>,
+  )
+
+  const groups = container.querySelectorAll('.sectionGroup')
+  expect(groups).toHaveLength(2)
+
+  // Bottom group should contain the Routes rail item
+  const bottomGroup = groups[1]
+  expect(bottomGroup.querySelector('[title="Routes"]')).toBeInTheDocument()
+})
+```
+
+- [ ] **Step 2: Run tests to verify they fail**
+
+Run: `npx vitest run src/design-system/layout/Sidebar/Sidebar.test.tsx`
+Expected: FAIL — no `.sectionGroup` wrappers exist yet, sections render directly in `{rest}`.
+
+- [ ] **Step 3: Rewrite the child partitioning logic in `SidebarRoot`**
+
+Replace the entire IIFE inside the `<aside>` (lines 198–240) with the following:
+
+```tsx
+{(() => {
+  const childArray = Children.toArray(children)
+
+  // Extract header
+  const headerIdx = childArray.findIndex(
+    (child) => isValidElement(child) && child.type === SidebarHeader,
+  )
+  const header = headerIdx >= 0 ? childArray[headerIdx] : null
+  const rest = headerIdx >= 0
+    ? [...childArray.slice(0, headerIdx), ...childArray.slice(headerIdx + 1)]
+    : childArray
+
+  // Extract footer
+  const footerIdx = rest.findIndex(
+    (child) => isValidElement(child) && child.type === SidebarFooter,
+  )
+  const footer = footerIdx >= 0 ? rest[footerIdx] : null
+  const sections = footerIdx >= 0
+    ? [...rest.slice(0, footerIdx), ...rest.slice(footerIdx + 1)]
+    : rest
+
+  // Partition sections into top/bottom by position prop
+  const topSections: typeof sections = []
+  const bottomSections: typeof sections = []
+  for (const child of sections) {
+    if (
+      isValidElement<SidebarSectionProps>(child) &&
+      child.props.position === 'bottom'
+    ) {
+      bottomSections.push(child)
+    } else {
+      topSections.push(child)
+    }
+  }
+
+  const hasBottomSections = bottomSections.length > 0
+
+  return (
+    <>
+      {header}
+      {onSearchChange && !collapsed && (
+        <div className={styles.searchWrap}>
+          <div className={styles.searchInner}>
+            <span className={styles.searchIcon} aria-hidden="true">
+              <Search size={12} />
+            </span>
+            <input
+              className={styles.searchInput}
+              type="text"
+              placeholder="Filter..."
+              value={searchValue ?? ''}
+              onChange={(e) => onSearchChange(e.target.value)}
+            />
+            {searchValue && (
+              <button
+                type="button"
+                className={styles.searchClear}
+                onClick={() => onSearchChange('')}
+                aria-label="Clear search"
+              >
+                <X size={12} />
+              </button>
+            )}
+          </div>
+        </div>
+      )}
+      <div className={styles.sectionGroup}>
+        {topSections}
+      </div>
+      {hasBottomSections && <div className={styles.sectionSpacer} />}
+      {hasBottomSections && (
+        <div className={styles.sectionGroup}>
+          {bottomSections}
+        </div>
+      )}
+      {footer}
+    </>
+  )
+})()}
+```
+
+- [ ] **Step 4: Run tests to verify they pass**
+
+Run: `npx vitest run src/design-system/layout/Sidebar/Sidebar.test.tsx`
+Expected: ALL PASS
+
+- [ ] **Step 5: Run the full test suite to check for regressions**
+
+Run: `npx vitest run`
+Expected: ALL PASS
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/design-system/layout/Sidebar/Sidebar.tsx src/design-system/layout/Sidebar/Sidebar.test.tsx
+git commit -m "feat: partition sidebar sections into top/bottom groups with spacer"
+```
+
+---
+
+### Task 4: Update `LayoutShell` to use `position="bottom"` on Routes and Starred sections
+
+**Files:**
+- Modify: `src/layout/LayoutShell.tsx:378-429` (the Routes and Starred section declarations)
+
+- [ ] **Step 1: Add `position="bottom"` to the Routes section**
+
+In `LayoutShell.tsx`, find the Routes `<Sidebar.Section>` (around line 378) and add `position="bottom"`:
+
+```tsx
+<Sidebar.Section
+  label="Routes"
+  icon={<GitBranch size={14} />}
+  open={!routesCollapsed}
+  onToggle={toggleRoutesCollapsed}
+  active={location.pathname.startsWith('/routes')}
+  position="bottom"
+>
+```
+
+- [ ] **Step 2: Add `position="bottom"` to the Starred section**
+
+Find the Starred `<Sidebar.Section>` (around line 396) and add `position="bottom"`:
+
+```tsx
+{hasStarred && (
+  <Sidebar.Section
+    label="★ Starred"
+    icon={<span />}
+    open={true}
+    onToggle={() => {}}
+    active={false}
+    position="bottom"
+  >
+```
+
+- [ ] **Step 3: Run the full test suite**
+
+Run: `npx vitest run`
+Expected: ALL PASS
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add src/layout/LayoutShell.tsx
+git commit -m "feat: position Routes and Starred sections at bottom of sidebar"
+```
+
+---
+
+### Task 5: Visual verification in the browser
+
+**Files:** None (manual verification)
+
+- [ ] **Step 1: Start the dev server**
+
+Run: `npm run dev`
+
+- [ ] **Step 2: Verify top/bottom layout**
+
+Open the app in a browser. Confirm:
+- Applications and Agents sections are at the top
+- Routes and Starred sections are at the bottom, above the footer
+- A flexible gap separates the two groups
+
+- [ ] **Step 3: Verify scrollbar styling**
+
+If a section has enough content to overflow (or temporarily add `maxHeight="100px"` to the Applications section in `LayoutShell.tsx`), confirm:
+- Content scrolls within the section
+- Scrollbar is thin (4px), with a muted thumb on a transparent track
+- Scrollbar thumb brightens on hover
+
+- [ ] **Step 4: Verify collapsed sidebar**
+
+Collapse the sidebar and confirm:
+- Top section icons stay at the top
+- Bottom section icons cluster near the footer
+- Spacer separates the two groups in the rail
+
+- [ ] **Step 5: Verify short viewport**
+
+Resize the browser window very short. Confirm:
+- Both top and bottom groups scroll independently
+- No content is permanently clipped or inaccessible
+
+- [ ] **Step 6: Remove any temporary `maxHeight` props added for testing**
+
+If you added `maxHeight="100px"` to Applications in Step 3, remove it now.
--- a/docs/superpowers/specs/2026-04-15-sidebar-section-layout-design.md
+++ b/docs/superpowers/specs/2026-04-15-sidebar-section-layout-design.md
@@ -0,0 +1,187 @@
+# Sidebar Section Layout: Top/Bottom Positioning & Scrollable Sections
+
+## Summary
+
+Extend `Sidebar.Section` with two new optional props:
+
+- `position: 'top' | 'bottom'` — controls whether a section stacks from the top of the sidebar or from the bottom (above the footer). Default: `'top'`.
+- `maxHeight: string` — CSS length value (e.g. `"250px"`, `"30vh"`) that constrains the section's content area. When content exceeds this height, it scrolls. The section header/toggle always remains visible.
+
+This enables a layout where primary sections (Applications, Agents) occupy the top of the sidebar, while secondary sections (Routes, Starred) cluster near the bottom — with a flexible spacer absorbing remaining vertical space between the two groups.
+
+## API Changes
+
+### `Sidebar.Section` — new optional props
+
+```tsx
+interface SidebarSectionProps {
+  icon: ReactNode
+  label: string
+  open: boolean
+  onToggle: () => void
+  active?: boolean
+  children: ReactNode
+  className?: string
+  position?: 'top' | 'bottom'  // default: 'top'
+  maxHeight?: string            // CSS length, e.g. "250px", "30vh"
+}
+```
+
+No changes to `Sidebar.Header`, `Sidebar.Footer`, `Sidebar.FooterLink`, or `SidebarRoot` props.
+
+### Consumer usage
+
+```tsx
+<Sidebar>
+  <Sidebar.Header ... />
+
+  <Sidebar.Section label="Applications" ...>
+    <SidebarTree ... />
+  </Sidebar.Section>
+
+  <Sidebar.Section label="Agents" ...>
+    <SidebarTree ... />
+  </Sidebar.Section>
+
+  <Sidebar.Section label="Routes" position="bottom" maxHeight="200px" ...>
+    <SidebarTree ... />
+  </Sidebar.Section>
+
+  <Sidebar.Section label="Starred" position="bottom" ...>
+    ...
+  </Sidebar.Section>
+
+  <Sidebar.Footer>...</Sidebar.Footer>
+</Sidebar>
+```
+
+## Layout Model
+
+### SidebarRoot child partitioning
+
+`SidebarRoot` already inspects children to extract `Header`. This extends the same pattern:
+
+1. Extract `Header` children (existing)
+2. Extract `Footer` children
+3. Partition remaining children into `topSections` and `bottomSections` based on `position` prop (default `'top'`)
+
+### Render structure
+
+```
+<aside class="sidebar">
+  [collapse toggle]
+  {header}
+  {search bar}
+  <div class="sectionGroup sectionGroupTop">
+    {topSections}
+  </div>
+  <div class="sectionSpacer" />
+  <div class="sectionGroup sectionGroupBottom">
+    {bottomSections}
+  </div>
+  {footer}
+</aside>
+```
+
+When there are no bottom sections, the spacer is omitted. The layout behaves identically to today — footer's `margin-top: auto` handles positioning. Zero breaking changes for existing consumers.
+
+### SidebarSection content wrapper
+
+A new `.sectionContent` div wraps only the `children` inside `SidebarSection` (not the toggle header). When `maxHeight` is provided, it receives the value as an inline `max-height` style.
+
+```tsx
+{open && (
+  <div
+    className={styles.sectionContent}
+    style={maxHeight ? { maxHeight } : undefined}
+  >
+    {children}
+  </div>
+)}
+```
+
+## CSS Changes
+
+### Group wrappers
+
+```css
+.sectionGroup {
+  flex: 0 1 auto;
+  overflow-y: auto;
+  min-height: 0;
+}
+
+.sectionSpacer {
+  flex: 1 0 0;
+}
+```
+
+### Section content scrolling
+
+```css
+.sectionContent {
+  overflow-y: auto;
+}
+```
+
+`maxHeight` is applied as an inline style, not a CSS class, since it varies per section instance.
+
+### Custom scrollbars
+
+Applied to both `.sectionGroup` and `.sectionContent` to keep the dark sidebar aesthetic:
+
+```css
+/* Standard (Firefox, modern Chrome/Edge) */
+scrollbar-width: thin;
+scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
+
+/* WebKit (Safari, older Chrome) */
+::-webkit-scrollbar {
+  width: 4px;
+}
+
+::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.15);
+  border-radius: 2px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: rgba(255, 255, 255, 0.3);
+}
+```
+
+## Collapsed Sidebar Behavior
+
+In collapsed (icon rail) mode, sections render as single icon buttons with no scrollable content:
+
+- **`position`**: Respected — bottom sections render in the bottom group, so their icons cluster near the footer in the rail.
+- **`maxHeight`**: Ignored — no content to constrain.
+
+The group wrapper and spacer structure remains active in collapsed mode for consistent icon positioning.
+
+## Edge Cases
+
+| Scenario | Behavior |
+|----------|----------|
+| All sections `"top"` (no bottom sections) | No spacer rendered. Identical to current layout. |
+| All sections `"bottom"` | Top group empty. Sections cluster above footer. |
+| `maxHeight` set but content is shorter | No visual effect — wrapper is naturally smaller than max. |
+| Very short viewport | Both group wrappers scroll independently via `overflow-y: auto` on `.sectionGroup`. |
+
+## Files Changed
+
+- `src/design-system/layout/Sidebar/Sidebar.tsx` — add `position` and `maxHeight` props to `SidebarSectionProps`, add `sectionContent` wrapper to `SidebarSection`, partition children in `SidebarRoot`
+- `src/design-system/layout/Sidebar/Sidebar.module.css` — add `.sectionGroup`, `.sectionSpacer`, `.sectionContent`, custom scrollbar styles
+- `src/design-system/layout/Sidebar/Sidebar.test.tsx` — new test cases for positioning and scrolling behavior
+
+## Tests
+
+- Section with `maxHeight` renders content wrapper with correct inline style and `overflow-y: auto`
+- Sections with `position="bottom"` render inside the bottom group wrapper
+- Default `position` (omitted) renders in the top group
+- When no bottom sections exist, no spacer is rendered
+- Collapsed sidebar renders bottom sections in the bottom group
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
  "name": "@cameleer/design-system",
-  "version": "0.1.50",
+  "version": "0.1.53",
  "type": "module",
  "main": "./dist/index.es.js",
  "module": "./dist/index.es.js",
--- a/src/design-system/layout/Sidebar/Sidebar.module.css
+++ b/src/design-system/layout/Sidebar/Sidebar.module.css
@@ -53,6 +53,12 @@
  justify-content: center;
 }

+.sidebarCollapsed .collapseToggle {
+  top: 52px;
+  right: 50%;
+  transform: translateX(50%);
+}
+
 .logoImg {
  width: 28px;
  height: 24px;
@@ -383,6 +389,62 @@
  color: var(--amber);
 }

+/* ── Section groups (top/bottom positioning) ───────────────────────────── */
+
+.sectionGroup {
+  flex: 0 1 auto;
+  overflow-y: auto;
+  min-height: 0;
+  scrollbar-width: thin;
+  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
+}
+
+.sectionGroup::-webkit-scrollbar {
+  width: 4px;
+}
+
+.sectionGroup::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.sectionGroup::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.15);
+  border-radius: 2px;
+}
+
+.sectionGroup::-webkit-scrollbar-thumb:hover {
+  background: rgba(255, 255, 255, 0.3);
+}
+
+.sectionSpacer {
+  flex: 1 0 0;
+}
+
+/* ── Section content (scrollable maxHeight) ────────────────────────────── */
+
+.sectionContent {
+  overflow-y: auto;
+  scrollbar-width: thin;
+  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
+}
+
+.sectionContent::-webkit-scrollbar {
+  width: 4px;
+}
+
+.sectionContent::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.sectionContent::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.15);
+  border-radius: 2px;
+}
+
+.sectionContent::-webkit-scrollbar-thumb:hover {
+  background: rgba(255, 255, 255, 0.3);
+}
+
 /* ── Bottom links ────────────────────────────────────────────────────────── */

 .bottom {
--- a/src/design-system/layout/Sidebar/Sidebar.test.tsx
+++ b/src/design-system/layout/Sidebar/Sidebar.test.tsx
@@ -324,4 +324,156 @@ describe('Sidebar compound component', () => {
    const item = screen.getByText('Admin').closest('[role="button"]')!
    expect(item.className).toMatch(/bottomItemActive/)
  })
+
+  // 17. renders sectionContent wrapper with maxHeight when open
+  it('renders section content wrapper with maxHeight style when open', () => {
+    const { container } = render(
+      <Wrapper>
+        <Sidebar>
+          <Sidebar.Section
+            icon={<span>ic</span>}
+            label="Apps"
+            open
+            onToggle={vi.fn()}
+            maxHeight="200px"
+          >
+            <div>child</div>
+          </Sidebar.Section>
+        </Sidebar>
+      </Wrapper>,
+    )
+
+    const contentWrapper = container.querySelector('.sectionContent')
+    expect(contentWrapper).toBeInTheDocument()
+    expect(contentWrapper).toHaveStyle({ maxHeight: '200px' })
+    expect(screen.getByText('child')).toBeInTheDocument()
+  })
+
+  // 18. renders sectionContent wrapper without maxHeight when not provided
+  it('renders section content wrapper without inline maxHeight when maxHeight is not provided', () => {
+    const { container } = render(
+      <Wrapper>
+        <Sidebar>
+          <Sidebar.Section
+            icon={<span>ic</span>}
+            label="Apps"
+            open
+            onToggle={vi.fn()}
+          >
+            <div>child</div>
+          </Sidebar.Section>
+        </Sidebar>
+      </Wrapper>,
+    )
+
+    const contentWrapper = container.querySelector('.sectionContent')
+    expect(contentWrapper).toBeInTheDocument()
+    expect(contentWrapper).not.toHaveStyle({ maxHeight: '200px' })
+    expect(screen.getByText('child')).toBeInTheDocument()
+  })
+
+  // 19. does not render sectionContent wrapper when section is closed
+  it('does not render section content wrapper when section is closed', () => {
+    const { container } = render(
+      <Wrapper>
+        <Sidebar>
+          <Sidebar.Section
+            icon={<span>ic</span>}
+            label="Apps"
+            open={false}
+            onToggle={vi.fn()}
+            maxHeight="200px"
+          >
+            <div>child</div>
+          </Sidebar.Section>
+        </Sidebar>
+      </Wrapper>,
+    )
+
+    const contentWrapper = container.querySelector('.sectionContent')
+    expect(contentWrapper).not.toBeInTheDocument()
+  })
+
+  // 20. renders top sections in sectionGroup wrapper
+  it('renders sections in top group wrapper by default', () => {
+    const { container } = render(
+      <Wrapper>
+        <Sidebar>
+          <Sidebar.Section icon={<span>ic</span>} label="Apps" open onToggle={vi.fn()}>
+            <div>apps content</div>
+          </Sidebar.Section>
+        </Sidebar>
+      </Wrapper>,
+    )
+
+    const topGroup = container.querySelector('.sectionGroup')
+    expect(topGroup).toBeInTheDocument()
+    expect(topGroup!.textContent).toContain('Apps')
+  })
+
+  // 21. renders bottom sections in separate group with spacer
+  it('renders bottom sections in a separate group with spacer between', () => {
+    const { container } = render(
+      <Wrapper>
+        <Sidebar>
+          <Sidebar.Section icon={<span>ic</span>} label="Apps" open onToggle={vi.fn()}>
+            <div>apps content</div>
+          </Sidebar.Section>
+          <Sidebar.Section icon={<span>ic</span>} label="Routes" open onToggle={vi.fn()} position="bottom">
+            <div>routes content</div>
+          </Sidebar.Section>
+        </Sidebar>
+      </Wrapper>,
+    )
+
+    const groups = container.querySelectorAll('.sectionGroup')
+    expect(groups).toHaveLength(2)
+    expect(groups[0].textContent).toContain('Apps')
+    expect(groups[1].textContent).toContain('Routes')
+
+    const spacer = container.querySelector('.sectionSpacer')
+    expect(spacer).toBeInTheDocument()
+  })
+
+  // 22. does not render spacer when no bottom sections
+  it('does not render spacer when all sections are top', () => {
+    const { container } = render(
+      <Wrapper>
+        <Sidebar>
+          <Sidebar.Section icon={<span>ic</span>} label="Apps" open onToggle={vi.fn()}>
+            <div>apps content</div>
+          </Sidebar.Section>
+          <Sidebar.Section icon={<span>ic</span>} label="Agents" open onToggle={vi.fn()}>
+            <div>agents content</div>
+          </Sidebar.Section>
+        </Sidebar>
+      </Wrapper>,
+    )
+
+    const spacer = container.querySelector('.sectionSpacer')
+    expect(spacer).not.toBeInTheDocument()
+  })
+
+  // 23. collapsed sidebar renders bottom sections in bottom group
+  it('renders bottom sections in bottom group when sidebar is collapsed', () => {
+    const { container } = render(
+      <Wrapper>
+        <Sidebar collapsed onCollapseToggle={vi.fn()}>
+          <Sidebar.Section icon={<span>ic</span>} label="Apps" open={false} onToggle={vi.fn()}>
+            <div>apps</div>
+          </Sidebar.Section>
+          <Sidebar.Section icon={<span>ic</span>} label="Routes" open={false} onToggle={vi.fn()} position="bottom">
+            <div>routes</div>
+          </Sidebar.Section>
+        </Sidebar>
+      </Wrapper>,
+    )
+
+    const groups = container.querySelectorAll('.sectionGroup')
+    expect(groups).toHaveLength(2)
+
+    // Bottom group should contain the Routes rail item
+    const bottomGroup = groups[1]
+    expect(bottomGroup.querySelector('[title="Routes"]')).toBeInTheDocument()
+  })
 })
--- a/src/design-system/layout/Sidebar/Sidebar.tsx
+++ b/src/design-system/layout/Sidebar/Sidebar.tsx
@@ -26,6 +26,8 @@ interface SidebarSectionProps {
  active?: boolean
  children: ReactNode
  className?: string
+  position?: 'top' | 'bottom'
+  maxHeight?: string
 }

 interface SidebarFooterProps {
@@ -83,6 +85,8 @@ function SidebarSection({
  active,
  children,
  className,
+  position: _position,
+  maxHeight,
 }: SidebarSectionProps) {
  const { collapsed, onCollapseToggle } = useSidebarContext()

@@ -125,7 +129,14 @@ function SidebarSection({
        {icon && <span className={styles.sectionIcon}>{icon}</span>}
        <span className={styles.treeSectionLabel}>{label}</span>
      </div>
-      {open && children}
+      {open && (
+        <div
+          className={styles.sectionContent}
+          style={maxHeight ? { maxHeight } : undefined}
+        >
+          {children}
+        </div>
+      )}
    </div>
  )
 }
@@ -194,9 +205,11 @@ function SidebarRoot({
          </button>
        )}

-        {/* Render Header first, then search, then remaining children */}
+        {/* Render Header first, then search, then partitioned sections, then footer */}
        {(() => {
          const childArray = Children.toArray(children)
+
+          // Extract header
          const headerIdx = childArray.findIndex(
            (child) => isValidElement(child) && child.type === SidebarHeader,
          )
@@ -205,6 +218,31 @@ function SidebarRoot({
            ? [...childArray.slice(0, headerIdx), ...childArray.slice(headerIdx + 1)]
            : childArray

+          // Extract footer
+          const footerIdx = rest.findIndex(
+            (child) => isValidElement(child) && child.type === SidebarFooter,
+          )
+          const footer = footerIdx >= 0 ? rest[footerIdx] : null
+          const sections = footerIdx >= 0
+            ? [...rest.slice(0, footerIdx), ...rest.slice(footerIdx + 1)]
+            : rest
+
+          // Partition sections into top/bottom by position prop
+          const topSections: typeof sections = []
+          const bottomSections: typeof sections = []
+          for (const child of sections) {
+            if (
+              isValidElement<SidebarSectionProps>(child) &&
+              child.props.position === 'bottom'
+            ) {
+              bottomSections.push(child)
+            } else {
+              topSections.push(child)
+            }
+          }
+
+          const hasBottomSections = bottomSections.length > 0
+
          return (
            <>
              {header}
@@ -234,7 +272,16 @@ function SidebarRoot({
                  </div>
                </div>
              )}
-              {rest}
+              <div className={styles.sectionGroup}>
+                {topSections}
+              </div>
+              {hasBottomSections && <div className={styles.sectionSpacer} />}
+              {hasBottomSections && (
+                <div className={styles.sectionGroup}>
+                  {bottomSections}
+                </div>
+              )}
+              {footer}
            </>
          )
        })()}
--- a/src/layout/LayoutShell.tsx
+++ b/src/layout/LayoutShell.tsx
@@ -381,6 +381,7 @@ export function LayoutShell() {
            open={!routesCollapsed}
            onToggle={toggleRoutesCollapsed}
            active={location.pathname.startsWith('/routes')}
+            position="bottom"
          >
            <SidebarTree
              nodes={routeNodes}
@@ -400,6 +401,7 @@ export function LayoutShell() {
              open={true}
              onToggle={() => {}}
              active={false}
+              position="bottom"
            >
              <StarredGroup
                label="Applications"
Author	SHA1	Message	Date
hsiegeln	df31ec55d8	chore: bump v0.1.53 — sidebar section positioning and scrollable maxHeight All checks were successful Build & Publish / publish (push) Successful in 1m52s Details Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-15 21:04:55 +02:00
hsiegeln	2ed7f8bb0c	feat: position Routes and Starred sections at bottom of sidebar	2026-04-15 21:01:29 +02:00
hsiegeln	90dee0f43e	feat: partition sidebar sections into top/bottom groups with spacer SidebarRoot now extracts SidebarFooter before partitioning remaining children into topSections / bottomSections based on the position prop. Top sections render in a .sectionGroup wrapper; when bottom sections exist a .sectionSpacer divider is added followed by a second .sectionGroup, pushing bottom nav to the foot of the sidebar. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-15 21:00:17 +02:00
hsiegeln	57d60bf2ed	feat: add maxHeight prop with sectionContent wrapper to SidebarSection Adds position and maxHeight to SidebarSectionProps and wraps children in a .sectionContent div when the section is open, enabling scrollable constrained height via inline style. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-15 20:57:43 +02:00
hsiegeln	7e2fce8b14	style: add section group, spacer, content, and scrollbar CSS classes	2026-04-15 20:56:03 +02:00
hsiegeln	96e5f77a14	docs: add sidebar section layout implementation plan Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-15 20:53:53 +02:00
hsiegeln	1c2c00d266	docs: add sidebar section layout design spec Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-15 20:51:12 +02:00
hsiegeln	70a4db94c1	chore: bump v0.1.52, fix sidebar collapse toggle position All checks were successful Build & Publish / publish (push) Successful in 1m51s Details Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-15 18:42:12 +02:00
hsiegeln	83722aeb7c	chore: bump v0.1.51 (v0.1.50 registry corruption) All checks were successful Build & Publish / publish (push) Successful in 1m46s Details Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-04-15 15:50:23 +02:00