Fix PyInstaller build issues and add right-click edit

## Fixes
- Web interface now loads correctly in built app (use sys._MEIPASS for bundled web files)
- Macro execution no longer locks up (use pyperclip clipboard for Unicode text support)
- Right-click context menu works (use Qt signals instead of fragile parent traversal)

## Changes
- web_server.py: Use get_resource_path() for web directory
- macro_manager.py: Use clipboard paste for text commands instead of typewrite
- gui/main_window.py: Add edit_requested/delete_requested signals to MacroButton
- pyproject.toml: Add pyperclip dependency
- All .spec files: Add pyperclip to hidden imports

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

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

macropad.spec

@@ -43,6 +43,7 @@ a = Analysis(
         'qrcode',
         'PIL',
         'pyautogui',
+        'pyperclip',
         'pystray',
         'netifaces',
         'websockets',