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/DashboardTab/DashboardL3.tsx

@@ -25,6 +25,9 @@ import {
   trendIndicator,
 } from './dashboard-utils';
 import styles from './DashboardTab.module.css';
+import tableStyles from '../../styles/table-section.module.css';
+import refreshStyles from '../../styles/refresh-indicator.module.css';
+import rateStyles from '../../styles/rate-colors.module.css';
 
 // ── Row types ───────────────────────────────────────────────────────────────
 
@@ -80,10 +83,10 @@ const PROCESSOR_COLUMNS: Column<ProcessorRow>[] = [
     sortable: true,
     render: (_, row) => {
       const cls = row.p99DurationMs > 300
-        ? styles.rateBad
+        ? rateStyles.rateBad
         : row.p99DurationMs > 200
-          ? styles.rateWarn
-          : styles.rateGood;
+          ? rateStyles.rateWarn
+          : rateStyles.rateGood;
       return <MonoText size="sm" className={cls}>{Math.round(row.p99DurationMs)}</MonoText>;
     },
   },
@@ -93,7 +96,7 @@ const PROCESSOR_COLUMNS: Column<ProcessorRow>[] = [
     sortable: true,
     render: (_, row) => {
       const pct = row.errorRate * 100;
-      const cls = pct > 5 ? styles.rateBad : pct > 1 ? styles.rateWarn : styles.rateGood;
+      const cls = pct > 5 ? rateStyles.rateBad : pct > 1 ? rateStyles.rateWarn : rateStyles.rateGood;
       return <MonoText size="sm" className={cls}>{pct.toFixed(2)}%</MonoText>;
     },
   },
@@ -347,9 +350,9 @@ export default function DashboardL3() {
 
   return (
     <div className={styles.content}>
-      <div className={styles.refreshIndicator}>
-        <span className={styles.refreshDot} />
-        <span className={styles.refreshText}>Auto-refresh: 30s</span>
+      <div className={refreshStyles.refreshIndicator}>
+        <span className={refreshStyles.refreshDot} />
+        <span className={refreshStyles.refreshText}>Auto-refresh: 30s</span>
       </div>
 
       {/* KPI Strip */}
@@ -398,11 +401,11 @@ export default function DashboardL3() {
       )}
 
       {/* Processor Metrics Table */}
-      <div className={styles.tableSection}>
-        <div className={styles.tableHeader}>
-          <span className={styles.tableTitle}>Processor Metrics</span>
+      <div className={tableStyles.tableSection}>
+        <div className={tableStyles.tableHeader}>
+          <span className={tableStyles.tableTitle}>Processor Metrics</span>
           <div>
-            <span className={styles.tableMeta}>
+            <span className={tableStyles.tableMeta}>
               {processorRows.length} processor{processorRows.length !== 1 ? 's' : ''}
             </span>
           </div>
@@ -417,8 +420,8 @@ export default function DashboardL3() {
       {/* Top 5 Errors — hidden if empty */}
       {errorRows.length > 0 && (
         <div className={styles.errorsSection}>
-          <div className={styles.tableHeader}>
-            <span className={styles.tableTitle}>Top 5 Errors</span>
+          <div className={tableStyles.tableHeader}>
+            <span className={tableStyles.tableTitle}>Top 5 Errors</span>
             <Badge label={`${errorRows.length}`} color="error" />
           </div>
           <DataTable