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/app/api/admin/randomize-labels/route.ts

@@ -1,36 +0,0 @@
-import { NextResponse } from 'next/server';
-import prisma from '@/lib/prisma';
-import { LABEL_COLORS } from '@/lib/types';
-import { auth } from '@/auth';
-
-export const dynamic = 'force-dynamic';
-
-export async function POST() {
-  try {
-    const session = await auth()
-    if (!session?.user?.id || (session.user as any).role !== 'ADMIN') {
-      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
-    }
-    const labels = await prisma.label.findMany();
-    const colors = Object.keys(LABEL_COLORS).filter(c => c !== 'gray'); // Exclude gray to force colors
-    
-    const updates = labels.map((label: any) => {
-      const randomColor = colors[Math.floor(Math.random() * colors.length)];
-      return prisma.label.update({
-        where: { id: label.id },
-        data: { color: randomColor }
-      });
-    });
-
-    await prisma.$transaction(updates);
-
-    return NextResponse.json({
-      success: true,
-      updated: updates.length,
-      message: "All labels have been assigned a random non-gray color."
-    });
-
-  } catch (error) {
-    return NextResponse.json({ error: String(error) }, { status: 500 });
-  }
-}