feat: add room mentions and clickable room/relay refs

package.json

@@ -12,6 +12,7 @@
     "tauri:icons": "tauri icon assets/logo.png --output src-tauri/icons",
     "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+    "test": "vitest run",
     "lint": "prettier --check src && eslint src",
     "format": "git diff head --name-only --diff-filter d | grep -E '(js|ts|svelte|css)$' | xargs -r prettier --write",
     "format:all": "prettier --write src",
@@ -39,7 +40,8 @@
     "tailwindcss": "^4.2.2",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.53.1",
-    "vite": "^5.4.21"
+    "vite": "^5.4.21",
+    "vitest": "^2.1.9"
   },
   "type": "module",
   "dependencies": {