Add setting to hide clipboard text in command palette

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This PR adds a new privacy-focused setting that allows users to hide clipboard content when displayed in the PowerToys Command Palette. This addresses security concerns when screen sharing or recording videos, preventing accidental exposure of sensitive information like passwords.

Changes Made

New Features

• Settings system: Added a Settings.cs class with a HideClipboardText boolean property (defaults to false for backward compatibility)
• Toggle command: Created ToggleHideClipboardCommand.cs that allows users to easily toggle the setting on/off with visual feedback
• Smart text hiding: Modified TypeInputCommand.cs to conditionally hide clipboard text while preserving user-typed input visibility

How It Works

• By default, clipboard text is displayed normally (maintains existing behavior)
• Users can access "Hide Clipboard Text: OFF/ON" from the Input Typer extension commands
• When enabled, clipboard commands show Type (Clipboard): '[hidden]' instead of the actual clipboard content
• User-typed text (non-clipboard) is never hidden, ensuring full functionality is preserved
• The setting persists during the current session

Example Usage

Before (clipboard contains "mypassword123"):
Type (Clipboard): 'mypassword123'

After enabling hide setting:
Type (Clipboard): '[hidden]'

User input remains unchanged:
Type: 'user entered text'

The implementation uses minimal, surgical changes - only 4 files modified with 56 lines added and 1 line changed. The solution specifically targets clipboard commands by detecting the "Clipboard" prefix, ensuring that only sensitive clipboard content is hidden while maintaining the extension's core functionality.

Fixes #6.

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