feat: live memory materialization — nodes spawn in 3D graph in real-time

When memories are created, promoted, deleted, or dreamed via MCP tools,
the 3D graph now shows spectacular live animations:

- Rainbow particle burst + elastic scale-up on MemoryCreated
- Ripple wave cascading to nearby nodes
- Green pulse + node growth on MemoryPromoted
- Implosion + dissolution on MemoryDeleted
- Edge growth animation on ConnectionDiscovered
- Purple cascade on DreamStarted/DreamProgress/DreamCompleted
- FIFO eviction at 50 live nodes to guard performance

Also: graph center defaults to most-connected node, legacy HTML
redirects to SvelteKit dashboard, CSS height chain fix in layout.

Testing: 150 unit tests (vitest), 11 e2e tests (Playwright with
MCP Streamable HTTP client), 22 proof screenshots.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/dashboard/package.json

@@ -1,27 +1,32 @@
 {
   "name": "@vestige/dashboard",
-  "version": "2.0.0",
+  "version": "2.0.3",
   "private": true,
   "type": "module",
   "scripts": {
     "dev": "vite dev",
     "build": "vite build",
     "preview": "vite preview",
-    "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json"
+    "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
+    "test": "vitest run",
+    "test:watch": "vitest"
   },
   "dependencies": {
     "three": "^0.172.0"
   },
   "devDependencies": {
+    "@playwright/test": "^1.58.2",
     "@sveltejs/adapter-static": "^3.0.0",
     "@sveltejs/kit": "^2.20.0",
     "@sveltejs/vite-plugin-svelte": "^5.0.0",
     "@tailwindcss/vite": "^4.0.0",
     "@types/three": "^0.172.0",
+    "@vitest/coverage-v8": "^4.0.18",
     "svelte": "^5.0.0",
     "svelte-check": "^4.0.0",
     "tailwindcss": "^4.0.0",
     "typescript": "^5.7.0",
-    "vite": "^6.0.0"
+    "vite": "^6.0.0",
+    "vitest": "^4.0.18"
   }
 }