Add test suite (63 tests) and CI workflow, fix Settings API bugs

Test suite covering all three layers:

Python backend (25 tests):
- AppController: state machine, start/stop, callbacks, settings reload
- API server: REST endpoints, config CRUD, status, devices
- Config: dot-notation get/set, persistence, nested paths
- Main headless: ready event port format validation

Svelte frontend (14 tests via Vitest):
- Backend store: exported properties/methods, port derivation, URLs
- Config store: method names (fetchConfig not loadConfig), defaults
- Transcriptions store: add/clear/plaintext
- File extension regression: ensures $state runes only in .svelte.ts

Rust sidecar (24 tests via cargo test):
- Platform/arch detection, asset name construction
- Ready event deserialization (with extra fields tolerance)
- Path construction, version read/write, old version cleanup
- Zip extraction, SidecarManager lifecycle

CI workflow (.gitea/workflows/test.yml):
- Runs on push to main and PRs
- Three parallel jobs: Python, Frontend, Rust

Also fixes three bugs found during test planning:
- Settings: /api/check-updates -> GET /api/check-update
- Settings: /api/remote/login -> /api/login
- Settings: /api/remote/register -> /api/register

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/components/Settings.svelte

@@ -214,7 +214,7 @@
 
   async function handleCheckUpdates() {
     try {
-      await backendStore.apiPost("/api/check-updates");
+      await backendStore.apiGet("/api/check-update");
     } catch (err) {
       console.error("Failed to check for updates:", err);
     }
@@ -222,7 +222,7 @@
 
   async function handleManagedLogin() {
     try {
-      await backendStore.apiPost("/api/remote/login", {
+      await backendStore.apiPost("/api/login", {
         email: managedEmail,
         password: managedPassword,
       });
@@ -233,7 +233,7 @@
 
   async function handleManagedRegister() {
     try {
-      await backendStore.apiPost("/api/remote/register", {
+      await backendStore.apiPost("/api/register", {
         email: managedEmail,
         password: managedPassword,
       });

src/lib/stores/backend.test.ts

@@ -0,0 +1,77 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { backendStore } from "./backend.svelte.ts";
+
+// Mock WebSocket globally so the store module can reference it
+class MockWebSocket {
+  onopen: ((ev: Event) => void) | null = null;
+  onclose: ((ev: CloseEvent) => void) | null = null;
+  onmessage: ((ev: MessageEvent) => void) | null = null;
+  onerror: ((ev: Event) => void) | null = null;
+  close = vi.fn();
+}
+vi.stubGlobal("WebSocket", MockWebSocket);
+
+// Mock fetch to prevent real network calls
+vi.stubGlobal(
+  "fetch",
+  vi.fn(() =>
+    Promise.resolve({
+      ok: true,
+      json: () => Promise.resolve({}),
+    })
+  )
+);
+
+describe("backend store", () => {
+  beforeEach(() => {
+    backendStore.disconnect();
+    backendStore.setPort(8081);
+  });
+
+  it("test_exports_expected_properties", () => {
+    expect(backendStore).toHaveProperty("port");
+    expect(backendStore).toHaveProperty("connectionState");
+    expect(backendStore).toHaveProperty("connected");
+    expect(backendStore).toHaveProperty("appState");
+    expect(backendStore).toHaveProperty("stateMessage");
+    expect(backendStore).toHaveProperty("deviceInfo");
+    expect(backendStore).toHaveProperty("version");
+    expect(backendStore).toHaveProperty("lastError");
+    expect(backendStore).toHaveProperty("apiBaseUrl");
+    expect(backendStore).toHaveProperty("wsUrl");
+    expect(backendStore).toHaveProperty("obsUrl");
+    expect(backendStore).toHaveProperty("syncUrl");
+  });
+
+  it("test_exports_expected_methods", () => {
+    expect(typeof backendStore.setPort).toBe("function");
+    expect(typeof backendStore.connect).toBe("function");
+    expect(typeof backendStore.disconnect).toBe("function");
+    expect(typeof backendStore.apiUrl).toBe("function");
+    expect(typeof backendStore.apiFetch).toBe("function");
+    expect(typeof backendStore.apiGet).toBe("function");
+    expect(typeof backendStore.apiPost).toBe("function");
+    expect(typeof backendStore.apiPut).toBe("function");
+  });
+
+  it("test_obsUrl_derives_from_port", () => {
+    backendStore.setPort(8081);
+    expect(backendStore.obsUrl).toBe("http://localhost:8080");
+  });
+
+  it("test_apiBaseUrl_uses_port", () => {
+    backendStore.setPort(8081);
+    expect(backendStore.apiBaseUrl).toBe("http://localhost:8081");
+  });
+
+  it("test_wsUrl_uses_port", () => {
+    backendStore.setPort(8081);
+    expect(backendStore.wsUrl).toBe("ws://localhost:8081/ws/control");
+  });
+
+  it("test_initial_state", () => {
+    // After disconnect() in beforeEach, state should be disconnected
+    expect(backendStore.connectionState).toBe("disconnected");
+    expect(backendStore.appState).toBe("initializing");
+  });
+});

src/lib/stores/config.test.ts

@@ -0,0 +1,48 @@
+import { describe, it, expect, vi } from "vitest";
+
+// Mock fetch so the backend store module doesn't make real requests
+vi.stubGlobal(
+  "fetch",
+  vi.fn(() =>
+    Promise.resolve({
+      ok: true,
+      json: () => Promise.resolve({}),
+    })
+  )
+);
+
+// Mock WebSocket for the backend store dependency
+class MockWebSocket {
+  onopen: ((ev: Event) => void) | null = null;
+  onclose: ((ev: CloseEvent) => void) | null = null;
+  onmessage: ((ev: MessageEvent) => void) | null = null;
+  onerror: ((ev: Event) => void) | null = null;
+  close = vi.fn();
+}
+vi.stubGlobal("WebSocket", MockWebSocket);
+
+import { configStore } from "./config.svelte.ts";
+
+describe("config store", () => {
+  it("test_has_fetchConfig_method", () => {
+    expect(typeof configStore.fetchConfig).toBe("function");
+  });
+
+  it("test_has_updateConfig_method", () => {
+    expect(typeof configStore.updateConfig).toBe("function");
+  });
+
+  it("test_config_defaults_have_expected_keys", () => {
+    const cfg = configStore.config;
+    expect(cfg).toHaveProperty("user");
+    expect(cfg).toHaveProperty("audio");
+    expect(cfg).toHaveProperty("transcription");
+    expect(cfg).toHaveProperty("display");
+    expect(cfg).toHaveProperty("remote");
+    expect(cfg).toHaveProperty("updates");
+  });
+
+  it("test_remote_config_has_byok_api_key", () => {
+    expect(configStore.config.remote.byok_api_key).toBeDefined();
+  });
+});

src/lib/stores/file-extension.test.ts

@@ -0,0 +1,34 @@
+import { describe, it, expect } from "vitest";
+import * as fs from "node:fs";
+import * as path from "node:path";
+
+describe("store file extensions", () => {
+  it("test_store_files_use_svelte_ts_extension", () => {
+    const storesDir = path.resolve(__dirname);
+    const files = fs.readdirSync(storesDir);
+
+    // Find .ts files that are NOT .svelte.ts and NOT test files
+    const plainTsFiles = files.filter(
+      (f) =>
+        f.endsWith(".ts") &&
+        !f.endsWith(".svelte.ts") &&
+        !f.endsWith(".test.ts")
+    );
+
+    for (const file of plainTsFiles) {
+      const content = fs.readFileSync(path.join(storesDir, file), "utf-8");
+      expect(content).not.toMatch(
+        /\$state\s*[<(]/,
+        `${file} uses $state() but does not have .svelte.ts extension`
+      );
+      expect(content).not.toMatch(
+        /\$derived\s*[<(]/,
+        `${file} uses $derived() but does not have .svelte.ts extension`
+      );
+      expect(content).not.toMatch(
+        /\$effect\s*[<(]/,
+        `${file} uses $effect() but does not have .svelte.ts extension`
+      );
+    }
+  });
+});

src/lib/stores/transcriptions.test.ts

@@ -0,0 +1,71 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+
+// Mock WebSocket for the backend store dependency (loaded transitively)
+class MockWebSocket {
+  onopen: ((ev: Event) => void) | null = null;
+  onclose: ((ev: CloseEvent) => void) | null = null;
+  onmessage: ((ev: MessageEvent) => void) | null = null;
+  onerror: ((ev: Event) => void) | null = null;
+  close = vi.fn();
+}
+vi.stubGlobal("WebSocket", MockWebSocket);
+
+vi.stubGlobal(
+  "fetch",
+  vi.fn(() =>
+    Promise.resolve({
+      ok: true,
+      json: () => Promise.resolve({}),
+    })
+  )
+);
+
+import { transcriptionStore } from "./transcriptions.svelte.ts";
+
+describe("transcriptions store", () => {
+  beforeEach(() => {
+    transcriptionStore.clearAll();
+  });
+
+  it("test_addTranscription", () => {
+    transcriptionStore.addTranscription({
+      text: "Hello world",
+      user_name: "TestUser",
+      timestamp: "12:00:00",
+    });
+
+    expect(transcriptionStore.items.length).toBe(1);
+    expect(transcriptionStore.items[0].text).toBe("Hello world");
+    expect(transcriptionStore.items[0].userName).toBe("TestUser");
+    expect(transcriptionStore.items[0].timestamp).toBe("12:00:00");
+    expect(transcriptionStore.items[0].isPreview).toBe(false);
+  });
+
+  it("test_clearAll", () => {
+    transcriptionStore.addTranscription({ text: "One" });
+    transcriptionStore.addTranscription({ text: "Two" });
+    expect(transcriptionStore.items.length).toBe(2);
+
+    transcriptionStore.clearAll();
+    expect(transcriptionStore.items.length).toBe(0);
+  });
+
+  it("test_getPlainText", () => {
+    transcriptionStore.addTranscription({
+      text: "Hello",
+      user_name: "Alice",
+      timestamp: "10:00",
+    });
+    transcriptionStore.addTranscription({
+      text: "World",
+      user_name: "Bob",
+      timestamp: "10:01",
+    });
+
+    const text = transcriptionStore.getPlainText();
+    expect(text).toContain("[10:00] Alice: Hello");
+    expect(text).toContain("[10:01] Bob: World");
+    // Lines separated by newline
+    expect(text.split("\n").length).toBe(2);
+  });
+});