Add automated test for window-audio-capture validation

- Add test/automated-capture-test.html: Self-contained test page that validates
  screen capture, app audio capture, and WebRTC pipeline without user interaction
- Add test-log IPC handler in main.js to forward renderer logs to terminal

Test validates:
- Edge window discovery via desktopCapturer
- Video capture using chromeMediaSourceId
- Audio session discovery (msedge.exe process)
- Native audio capture via WASAPI process loopback
- Audio level detection (RMS analysis)
- WebRTC video/audio loopback transmission

Run with: npm start -- --url="file:///.../test/automated-capture-test.html" --node

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: steveseguin

main.js

@@ -17,6 +17,12 @@ ipcMain.on('getSources', async function(eventRet, args) {
 	} catch(e){console.error(e);}
 });
 
+// Test logging handler - forwards renderer logs to main process console
+ipcMain.on('test-log', (event, { type, msg }) => {
+	const prefix = type === 'error' ? '\x1b[31m' : type === 'success' ? '\x1b[32m' : '\x1b[36m';
+	const reset = '\x1b[0m';
+	console.log(`${prefix}[TEST:${type.toUpperCase()}]${reset} ${msg}`);
+});
 
 const { Readable } = require('stream');
 const { fetch: undiciFetch } = require('undici');