feat: v1.2.0 — auto-reconnect, recording, monitor bounds, WASAPI loopback

- Auto-reconnect: stream retries with exponential backoff (2s→30s max)
  on unexpected exit; stops only when user clicks Stop
- Recording: global RecordingBar with folder picker, segment duration (min),
  per-stream checkbox, Select All; uses FFmpeg tee muxer for simultaneous
  SRT + segmented .ts file output
- Monitor capture: PowerShell System.Windows.Forms.Screen gives exact
  pixel bounds (x/y/width/height); per-monitor deviceName is now unique
  (desktop_monitor_N); gdigrab uses -offset_x/-offset_y/-video_size
- Window capture: windowTitle now explicitly propagated in handleVideoSelect
- System audio: added WASAPI Loopback option (no VB-Audio required),
  existing virtual-audio-capturer kept as fallback
- Reconnecting event forwarded to renderer; status shows "Reconnecting…"
  with attempt count in logs
- IPC: pick-folder (dialog.showOpenDialog) and open-folder (shell.openPath)

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

electron/preload.js

@@ -2,7 +2,7 @@ const { contextBridge, ipcRenderer } = require('electron')
 
 contextBridge.exposeInMainWorld('electronAPI', {
   // Config
-  getConfig: () => ipcRenderer.invoke('get-config'),
+  getConfig:  () => ipcRenderer.invoke('get-config'),
   saveConfig: (config) => ipcRenderer.invoke('save-config', config),
 
   // Devices
@@ -10,25 +10,30 @@ contextBridge.exposeInMainWorld('electronAPI', {
   getWindows: () => ipcRenderer.invoke('get-windows'),
 
   // Streams
-  startStream: (config) => ipcRenderer.invoke('start-stream', config),
-  stopStream: (id) => ipcRenderer.invoke('stop-stream', id),
-  getActiveStreams: () => ipcRenderer.invoke('get-active-streams'),
+  startStream:     (config) => ipcRenderer.invoke('start-stream', config),
+  stopStream:      (id)     => ipcRenderer.invoke('stop-stream', id),
+  getActiveStreams: ()       => ipcRenderer.invoke('get-active-streams'),
 
   // Tolbek receiver
   startTolbek: (config) => ipcRenderer.invoke('start-tolbek', config),
-  stopTolbek: () => ipcRenderer.invoke('stop-tolbek'),
+  stopTolbek:  ()       => ipcRenderer.invoke('stop-tolbek'),
+
+  // File system helpers
+  pickFolder:  () => ipcRenderer.invoke('pick-folder'),
+  openFolder:  (p) => ipcRenderer.invoke('open-folder', p),
 
   // Window controls
   minimizeWindow: () => ipcRenderer.invoke('minimize-window'),
-  hideWindow: () => ipcRenderer.invoke('hide-window'),
+  hideWindow:     () => ipcRenderer.invoke('hide-window'),
   updateTrayCount: (count) => ipcRenderer.send('update-tray-count', count),
 
   // Event listeners
-  onStreamStatus: (cb) => ipcRenderer.on('stream-status', (_, data) => cb(data)),
-  onStreamLog: (cb) => ipcRenderer.on('stream-log', (_, data) => cb(data)),
-  onStreamError: (cb) => ipcRenderer.on('stream-error', (_, data) => cb(data)),
-  onStreamEnded: (cb) => ipcRenderer.on('stream-ended', (_, data) => cb(data)),
-  onAllStreamsStopped: (cb) => ipcRenderer.on('all-streams-stopped', () => cb()),
+  onStreamStatus:       (cb) => ipcRenderer.on('stream-status',       (_, d) => cb(d)),
+  onStreamLog:          (cb) => ipcRenderer.on('stream-log',          (_, d) => cb(d)),
+  onStreamError:        (cb) => ipcRenderer.on('stream-error',        (_, d) => cb(d)),
+  onStreamEnded:        (cb) => ipcRenderer.on('stream-ended',        (_, d) => cb(d)),
+  onStreamReconnecting: (cb) => ipcRenderer.on('stream-reconnecting', (_, d) => cb(d)),
+  onAllStreamsStopped:  (cb) => ipcRenderer.on('all-streams-stopped', () => cb()),
 
   removeAllListeners: (channel) => ipcRenderer.removeAllListeners(channel)
 })