feat(v2): scaffold Tauri 2.x + Svelte 5 project (Phase 1)

- Tauri 2.10 + Svelte 5.45 + TypeScript + Vite 7
- Catppuccin Mocha theme with CSS variables and semantic aliases
- CSS Grid layout: sidebar (260px) + workspace, responsive breakpoints
  for ultrawide (3440px+) and narrow (<1200px)
- Component structure: Layout/, Terminal/, Agent/, Markdown/, Sidebar/
- Svelte 5 stores with $state runes: sessions, agents, layout
- SDK message adapter (abstracts Agent SDK wire format)
- PTY bridge (Tauri IPC wrapper, stubbed for Phase 2)
- Node.js sidecar entry point (stdio NDJSON, stubbed for Phase 3)
- Rust modules: pty, sidecar, watcher, session (stubbed)
- Vite dev server on port 9700
- Build verified: binary + .deb + .rpm + AppImage all produced

v2/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "bterminal-v2",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "check": "svelte-check --tsconfig ./tsconfig.app.json && tsc -p tsconfig.node.json",
+    "tauri": "cargo tauri",
+    "tauri:dev": "cargo tauri dev",
+    "tauri:build": "cargo tauri build"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "^6.2.1",
+    "@tsconfig/svelte": "^5.0.6",
+    "@types/node": "^24.10.1",
+    "svelte": "^5.45.2",
+    "svelte-check": "^4.3.4",
+    "typescript": "~5.9.3",
+    "vite": "^7.3.1"
+  }
+}