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/stores/ai.ts

@@ -0,0 +1,17 @@
+import { writable } from 'svelte/store';
+
+export interface AIConfig {
+  default_provider: string;
+  providers: Record<string, { model: string; [key: string]: unknown }>;
+}
+
+export interface ChatMessage {
+  role: 'user' | 'assistant';
+  content: string;
+}
+
+export const aiConfig = writable<AIConfig>({
+  default_provider: 'local',
+  providers: {},
+});
+export const chatHistory = writable<ChatMessage[]>([]);

src/lib/stores/playback.ts

@@ -0,0 +1,5 @@
+import { writable } from 'svelte/store';
+
+export const isPlaying = writable(false);
+export const currentTimeMs = writable(0);
+export const durationMs = writable(0);

src/lib/stores/project.ts

@@ -0,0 +1,5 @@
+import { writable } from 'svelte/store';
+import type { Project } from '$lib/types/project';
+
+export const currentProject = writable<Project | null>(null);
+export const projects = writable<Project[]>([]);

src/lib/stores/transcript.ts

@@ -0,0 +1,5 @@
+import { writable } from 'svelte/store';
+import type { Segment, Speaker } from '$lib/types/transcript';
+
+export const segments = writable<Segment[]>([]);
+export const speakers = writable<Speaker[]>([]);