Window Lock Mode: Fixed Size with Tiling-Only Rescaling (Windows 11)

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### Description of the new feature / enhancement

Introduce a new Window Lock Mode in PowerToys for Windows 11.
This mode would allow users to lock application windows to a predefined size, preventing manual resizing. The only resizing permitted would be through tiling mode, ensuring consistent layouts and improved workflow efficiency.

### Scenario when this would be used?

- **Use Case:**

- Users who want strict control over window dimensions for productivity setups.
- Ideal for developers, designers, or multitaskers who rely on consistent window arrangements.
- **Behavior:**

- When enabled, windows remain locked to a set size.
- Manual drag-resizing is disabled.
- Resizing is only possible when snapping/tiling windows using Windows 11’s native tiling features or FancyZones.
- **Benefits:**

- Prevents accidental resizing.
- Ensures uniform layouts across multiple applications.
- Enhances usability for tiling workflows.
- **Scope:**

- Feature designed exclusively for **Windows 11**.
- Integration with existing PowerToys modules (e.g., FancyZones) for seamless experience.

### Supporting information

_No response_

The issue names no files, tests, or entry points, so start by locating the existing FancyZones integration and its handling of Windows 11 tiling. Define the behavior around a fixed window size, disabled manual drag-resizing, and resizing through native snapping or FancyZones; done means these rules work consistently for supported windows.

Written by the indexing model from the issue text.