chore: remove dead code — 8 components, 5 libs, 4 API routes, 4 npm packages, 30+ scripts, dead CSS, dead exports

Removed unused components:
- brainstorm-canvas, brainstorm-create-dialog, invite-dialog, manual-idea-dialog
- note-inline-editor, profile-page-header, quota-paywall, label-management-dialog

Removed dead lib files:
- api-auth.ts, color-harmony-recommendation.ts, label-storage.ts, modern-color-options.ts
- hooks/use-card-size-mode.ts

Removed dead API routes:
- ai/test-chat, ai/test-embeddings, ai/test-tags, admin/randomize-labels

Removed unused npm packages:
- cmdk, novel, tippy.js, react-force-graph-2d

Cleaned dead CSS from globals.css:
- acrylic-*, win11-shadow-*, muuri-grid/item, ai-glass, ai-tab-indicator, ai-send-btn, sidebar-view-toggle, memento-sidebar-depth

Removed 29 orphan scripts and 3 root orphan files

Cleaned dead exports from 8 lib files:
- NOTE_TYPE_CONFIG, getPublishableKey, PROVIDER_DEFAULTS, useNotes/useNote/invalidateNote, etc.

memento-note/lib/ai/fallback.ts

@@ -174,20 +174,6 @@ function getSecondaryProvider(lane: AiFeatureLane, config: Record<string, string
   }
 }
 
-export function shouldLogAiFallback(): boolean {
-  return process.env.NODE_ENV !== 'production' || process.env.MEMENTO_AI_ROUTE_DEBUG === '1'
-}
-
-export function formatAiFallbackDebug(meta: {
-  lane: AiFeatureLane
-  primaryProvider: string
-  secondaryProvider: string
-  primaryStatus?: number
-  fallbackMs: number
-}): string {
-  return JSON.stringify(meta)
-}
-
 function logFallbackSuccess(meta: {
   lane: AiFeatureLane
   primaryProvider: string
@@ -195,12 +181,13 @@ function logFallbackSuccess(meta: {
   primaryStatus?: number
   fallbackMs: number
 }): void {
-  if (!shouldLogAiFallback()) return
-  console.debug('[ai-fallback]', formatAiFallbackDebug(meta))
-  if (meta.fallbackMs > FALLBACK_BUDGET_MS) {
-    console.warn(
-      `[ai-fallback] NFR-R1 budget exceeded: ${meta.fallbackMs.toFixed(1)}ms > ${FALLBACK_BUDGET_MS}ms`
-    )
+  if (process.env.NODE_ENV !== 'production' || process.env.MEMENTO_AI_ROUTE_DEBUG === '1') {
+    console.debug('[ai-fallback]', JSON.stringify(meta))
+    if (meta.fallbackMs > FALLBACK_BUDGET_MS) {
+      console.warn(
+        `[ai-fallback] NFR-R1 budget exceeded: ${meta.fallbackMs.toFixed(1)}ms > ${FALLBACK_BUDGET_MS}ms`
+      )
+    }
   }
 }