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/playwright.config.ts

@@ -0,0 +1,27 @@
+import { defineConfig } from '@playwright/test';
+
+const PORT = 5199;
+
+export default defineConfig({
+	testDir: './e2e',
+	timeout: 60_000,
+	expect: { timeout: 10_000 },
+	fullyParallel: false,
+	retries: 0,
+	reporter: [['list'], ['html', { open: 'never' }]],
+	use: {
+		baseURL: `http://localhost:${PORT}`,
+		screenshot: 'on',
+		video: 'retain-on-failure',
+		trace: 'retain-on-failure',
+		launchOptions: {
+			args: ['--use-gl=angle', '--ignore-gpu-blocklist'],
+		},
+	},
+	webServer: {
+		command: `npx vite dev --port ${PORT}`,
+		port: PORT,
+		reuseExistingServer: true,
+		timeout: 30_000,
+	},
+});