Implement Phase 1: Global hotkey, HUD, and audio capture

Add complete listening UX without STT:
- Global hotkey manager with ⌘⇧V, push-to-talk and toggle modes
- Floating HUD with real-time RMS audio visualization
- AVAudioEngine capture with 16kHz mono PCM conversion
- 10-minute dictation timeout with ESC cancellation
- Optional start/stop sounds and microphone permissions
- Permission management for accessibility and input monitoring

All Phase 1 acceptance criteria met.

Resources/Info.plist

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleDevelopmentRegion</key>
+    <string>en</string>
+    <key>CFBundleDisplayName</key>
+    <string>Menu-Whisper</string>
+    <key>CFBundleExecutable</key>
+    <string>MenuWhisper</string>
+    <key>CFBundleIdentifier</key>
+    <string>com.menuwhisper.app</string>
+    <key>CFBundleInfoDictionaryVersion</key>
+    <string>6.0</string>
+    <key>CFBundleName</key>
+    <string>Menu-Whisper</string>
+    <key>CFBundlePackageType</key>
+    <string>APPL</string>
+    <key>CFBundleShortVersionString</key>
+    <string>1.0.0</string>
+    <key>CFBundleVersion</key>
+    <string>1</string>
+    <key>LSMinimumSystemVersion</key>
+    <string>13.0</string>
+    <key>LSUIElement</key>
+    <true/>
+    <key>NSHumanReadableCopyright</key>
+    <string>Copyright © 2025. All rights reserved.</string>
+    <key>NSMicrophoneUsageDescription</key>
+    <string>Menu-Whisper needs access to your microphone to capture speech for offline transcription. Your audio data never leaves your device.</string>
+    <key>NSSupportsAutomaticTermination</key>
+    <true/>
+    <key>NSSupportsSuddenTermination</key>
+    <false/>
+</dict>
+</plist>