♻️ refactor: optimize state management, switch to @tanstack/vue-virtual, and improve performance

- Centralize `useAgents` and `useModels` state within the Nuxt app context to prevent data leaks and improve initialization.
- Migrate virtualization from `vue-virtual-scroller` to `@tanstack/vue-virtual` with new `RowVirtualizerFixed` and `RowVirtualizerDynamic` components.
- Upgrade Nuxt to v4.3.1 and remove `@vue-macros/nuxt`.
- Replace `big.js` with an optimized custom `lshDecimal` string manipulation logic for pricing calculations in the provider API.
- Implement automatic focus redirection in `ChatInput` to capture standard keyboard input.
- Refactor Sidenav and Settings components to utilize virtualization for long lists (topics, agents, models).
- Enhance theme colors and mobile experience. More work to come on both of these.

package.json

@@ -8,8 +8,7 @@
         "dev": "nuxt dev",
         "generate": "nuxt generate",
         "preview": "nuxt preview",
-        "postinstall": "nuxt prepare",
-        "knip": "knip"
+        "postinstall": "nuxt prepare"
     },
     "dependencies": {
         "@ai-sdk/cerebras": "^2.0.34",
@@ -18,15 +17,15 @@
         "@ai-sdk/openai-compatible": "^2.0.30",
         "@daveyplate/better-auth-triplit": "^0.2.2",
         "@iconify-json/mynaui": "^1.2.17",
-        "@nuxt/fonts": "0.13.0",
+        "@nuxt/fonts": "0.14.0",
         "@nuxt/hints": "1.0.0-alpha.5",
         "@nuxt/icon": "2.2.0",
         "@openrouter/ai-sdk-provider": "^2.2.3",
         "@sentry/nuxt": "^10.39.0",
+        "@tanstack/vue-virtual": "^3.13.18",
         "@triplit/client": "^1.0.50",
         "@triplit/server": "^1.1.8",
         "@types/big.js": "^6.2.2",
-        "@vue-macros/nuxt": "^3.1.2",
         "ai": "^6.0.89",
         "ai-sdk-ollama": "^3.7.1",
         "better-auth": "^1.4.18",
@@ -34,7 +33,7 @@
         "comlink": "^4.4.2",
         "glob": "^13.0.5",
         "nanoid": "^5.1.6",
-        "nuxt": "4.2.2",
+        "nuxt": "^4.3.1",
         "rehype-katex": "^7.0.1",
         "remark-gfm": "^4.0.1",
         "remark-math": "^6.0.0",
@@ -44,8 +43,7 @@
         "triplit-nuxt": "0.3.1-prerelease.5",
         "unified": "^11.0.5",
         "vue": "^3.5.28",
-        "vue-router": "^4.6.4",
-        "vue-virtual-scroller": "^2.0.0-beta.8",
+        "vue-router": "^5.0.3",
         "zod": "^4.3.6"
     },
     "devDependencies": {
@@ -63,6 +61,7 @@
     },
     "trustedDependencies": [
         "@parcel/watcher",
+        "@sentry/cli",
         "core-js",
         "esbuild",
         "unrs-resolver"
@@ -73,6 +72,6 @@
     },
     "overrides": {
         "@vercel/nft": "^0.27.4",
-        "vite": "8.0.0-beta.0"
+        "vite": "8.0.0-beta.15"
     }
 }