feat(ui): sweep remaining components for Deep Space consistency

Replace old design tokens and hardcoded colors across 29 files:
- bg-primary/text-primary-foreground -> bg-accent/text-white
- text-muted-foreground -> text-text-muted
- text-destructive/bg-destructive -> text-error/bg-error
- bg-muted -> bg-elevated (background usage)
- Hardcoded green/red/yellow/emerald/amber/slate -> semantic tokens
- Remove shadow-md/lg from cards, tooltips, topology nodes
- rounded-xl -> rounded-lg on cards/panels
- focus:ring-1 focus:ring-ring -> focus:border-accent on inputs

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

frontend/src/components/settings/ApiKeysPage.tsx

@@ -264,7 +264,7 @@ export function ApiKeysPage({ tenantId }: ApiKeysPageProps) {
               </label>
               <input
                 type="text"
-                className="w-full rounded-md border border-border-bright bg-elevated/50 px-3 py-2 text-sm focus:outline-none focus:ring-1 focus:ring-ring"
+                className="w-full rounded-md border border-border-bright bg-elevated/50 px-3 py-2 text-sm focus:border-accent focus:outline-none"
                 placeholder="e.g. Monitoring Integration"
                 value={name}
                 onChange={(e) => setName(e.target.value)}
@@ -300,7 +300,7 @@ export function ApiKeysPage({ tenantId }: ApiKeysPageProps) {
               </label>
               <input
                 type="date"
-                className="w-full rounded-md border border-border-bright bg-elevated/50 px-3 py-2 text-sm focus:outline-none focus:ring-1 focus:ring-ring"
+                className="w-full rounded-md border border-border-bright bg-elevated/50 px-3 py-2 text-sm focus:border-accent focus:outline-none"
                 value={expiresAt}
                 onChange={(e) => setExpiresAt(e.target.value)}
                 min={new Date().toISOString().split('T')[0]}