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/lib/types/ipc.ts

@@ -0,0 +1,16 @@
+export interface IPCMessage {
+  id: string;
+  type: string;
+  payload: Record<string, unknown>;
+}
+
+export interface ProgressPayload {
+  percent: number;
+  stage: string;
+  message: string;
+}
+
+export interface ErrorPayload {
+  code: string;
+  message: string;
+}

src/lib/types/project.ts

@@ -0,0 +1,21 @@
+export interface Project {
+  id: string;
+  name: string;
+  created_at: string;
+  updated_at: string;
+  settings: string | null;
+  status: string;
+}
+
+export interface MediaFile {
+  id: string;
+  project_id: string;
+  file_path: string;
+  file_hash: string | null;
+  duration_ms: number | null;
+  sample_rate: number | null;
+  channels: number | null;
+  format: string | null;
+  file_size: number | null;
+  created_at: string;
+}

src/lib/types/transcript.ts

@@ -0,0 +1,33 @@
+export interface Word {
+  id: string;
+  segment_id: string;
+  word: string;
+  start_ms: number;
+  end_ms: number;
+  confidence: number | null;
+  word_index: number;
+}
+
+export interface Segment {
+  id: string;
+  project_id: string;
+  media_file_id: string;
+  speaker_id: string | null;
+  start_ms: number;
+  end_ms: number;
+  text: string;
+  original_text: string | null;
+  confidence: number | null;
+  is_edited: boolean;
+  edited_at: string | null;
+  segment_index: number;
+  words: Word[];
+}
+
+export interface Speaker {
+  id: string;
+  project_id: string;
+  label: string;
+  display_name: string | null;
+  color: string | null;
+}