Fix macOS special character input in terminal (Issue #41)

- Add custom keyboard event handler for macOS Option key combinations
- Enable Option+7 to input pipe symbol (|) in Safari and Firefox
- Support additional special characters: @, €, [, ], commonly used on macOS
- Use both e.key and e.code for robust keyboard layout compatibility
- Only activate on macOS platform to avoid affecting other systems
- Maintain xterm.js native handling as primary with custom handler as fallback

Resolves GitHub Issue #41 where users couldn't type pipe symbol with Option+7 on Mac.

src/ui/Mobile/Apps/Terminal/Terminal.tsx

@@ -175,6 +175,7 @@ export const Terminal = forwardRef<any, SSHTerminalProps>(function SSHTerminal(
       allowTransparency: true,
       convertEol: true,
       windowsMode: false,
+      // Keep Option key for special characters on macOS (false = allows special chars, true = Meta key)
       macOptionIsMeta: false,
       macOptionClickForcesSelection: false,
       rightClickSelectsWord: false,