refactor: UI consistency — shared CSS, design system colors, no inline styles

Phase 1: Extract 6 shared CSS modules (table-section, log-panel,
rate-colors, refresh-indicator, chart-card, section-card) eliminating
~135 duplicate class definitions across 11 files.

Phase 2: Replace all hardcoded hex colors in CSS modules with design
system variables. Strip ~55 hex fallbacks from var() patterns. Fix 4
undefined variable names (--accent, --bg-base, --surface, --bg-surface-raised).

Phase 3: Replace ~45 hardcoded hex values in ProcessDiagram SVG
components with var() CSS custom properties. Fix Dashboard.tsx color prop.

Phase 4: Create CSS modules for AdminLayout, DatabaseAdminPage,
OidcCallback (previously 100% inline). Extract shared PageLoader
component (replaces 3 copy-pasted spinner patterns). Move AppsTab
static inline styles to CSS classes. Extract LayoutShell StarredList styles.

58 files changed, net -219 lines.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/DeploymentProgress.module.css

@@ -45,7 +45,7 @@
   height: 10px;
   border-radius: 50%;
   border: 2px solid var(--border-subtle);
-  background: var(--surface, #1a1a1a);
+  background: var(--bg-surface);
   display: flex;
   align-items: center;
   justify-content: center;
@@ -56,7 +56,7 @@
 .dot.completed {
   background: var(--amber);
   border-color: var(--amber);
-  color: var(--surface, #1a1a1a);
+  color: var(--bg-surface);
 }
 
 .dot.active {