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/pages/RuntimeTab/RuntimePage.tsx

@@ -1,17 +1,15 @@
 import { useParams } from 'react-router';
 import { lazy, Suspense } from 'react';
-import { Spinner } from '@cameleer/design-system';
+import { PageLoader } from '../../components/PageLoader';
 
 const AgentHealth = lazy(() => import('../AgentHealth/AgentHealth'));
 const AgentInstance = lazy(() => import('../AgentInstance/AgentInstance'));
 
-const Fallback = <div style={{ display: 'flex', justifyContent: 'center', padding: '4rem' }}><Spinner size="lg" /></div>;
-
 export default function RuntimePage() {
   const { instanceId } = useParams<{ appId?: string; instanceId?: string }>();
 
   if (instanceId) {
-    return <Suspense fallback={Fallback}><AgentInstance /></Suspense>;
+    return <Suspense fallback={<PageLoader />}><AgentInstance /></Suspense>;
   }
-  return <Suspense fallback={Fallback}><AgentHealth /></Suspense>;
+  return <Suspense fallback={<PageLoader />}><AgentHealth /></Suspense>;
 }