Phase 1 foundation: Tauri shell, Python sidecar, SQLite database

Tauri v2 + Svelte + TypeScript frontend:
- App shell with workspace layout (waveform, transcript, speakers, AI chat)
- Placeholder components for all major UI areas
- Typed stores (project, transcript, playback, AI)
- TypeScript interfaces matching the database schema
- Tauri bridge service with typed invoke wrappers
- svelte-check passes with 0 errors

Rust backend:
- Tauri v2 app entry point with command registration
- SQLite database layer (rusqlite with bundled SQLite)
  - Full schema: projects, media_files, speakers, segments, words,
    ai_outputs, annotations (with indexes)
  - Model structs with serde serialization
  - CRUD queries for projects, speakers, segments, words
  - Segment text editing preserves original text
  - Schema versioning for future migrations
  - 6 tests passing
- Command stubs for project, transcribe, export, AI, settings, system
- App state management

Python sidecar:
- JSON-line IPC protocol (stdin/stdout)
- Message types: IPCMessage, progress, error, ready
- Handler registry with routing and error handling
- Ping/pong handler for connectivity testing
- Service stubs: transcribe, diarize, pipeline, AI, export
- Provider stubs: local (llama-server), OpenAI, Anthropic, LiteLLM
- Hardware detection stubs
- 14 tests passing, ruff clean

Also adds:
- Testing strategy document (docs/TESTING.md)
- Validation script (scripts/validate.sh)
- Updated .gitignore for Svelte, Rust, Python artifacts

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

src/routes/+layout.ts

@@ -0,0 +1,5 @@
+// Tauri doesn't have a Node.js server to do proper SSR
+// so we use adapter-static with a fallback to index.html to put the site in SPA mode
+// See: https://svelte.dev/docs/kit/single-page-apps
+// See: https://v2.tauri.app/start/frontend/sveltekit/ for more info
+export const ssr = false;

src/routes/+page.svelte

@@ -0,0 +1,38 @@
+<script lang="ts">
+  import WaveformPlayer from '$lib/components/WaveformPlayer.svelte';
+  import TranscriptEditor from '$lib/components/TranscriptEditor.svelte';
+  import SpeakerManager from '$lib/components/SpeakerManager.svelte';
+  import AIChatPanel from '$lib/components/AIChatPanel.svelte';
+</script>
+
+<div class="workspace">
+  <div class="main-content">
+    <WaveformPlayer />
+    <TranscriptEditor />
+  </div>
+  <div class="sidebar-right">
+    <SpeakerManager />
+    <AIChatPanel />
+  </div>
+</div>
+
+<style>
+  .workspace {
+    display: flex;
+    gap: 1rem;
+    padding: 1rem;
+    height: calc(100vh - 3rem);
+  }
+  .main-content {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    gap: 1rem;
+  }
+  .sidebar-right {
+    width: 300px;
+    display: flex;
+    flex-direction: column;
+    gap: 1rem;
+  }
+</style>