Fix clipboard deadlock by removing aggressive Wayland image watcher

[D-Pagey]

Problem:
The Omarchy clipboard manager ran a continuous wl-paste --type image/png --watch process to capture image history. In Wayland, when an image is copied (e.g., from Chromium, Brave, or a screenshot tool), the source application often uses a single-use pipe to serve the clipboard data. Because this background watcher immediately requests the data, it consumes the single-use pipe before the user can paste it into another application. This leaves the user's paste target with nothing and results in stuck wl-copy processes that deadlock the clipboard entirely.

Solution:
This PR completely removes the imageWatchProc from the clipboard manager.

While this means Omarchy no longer maintains a background history of copied images, it guarantees that image pasting works reliably 100% of the time. Text history remains perfectly intact because text payloads are tiny and aren't subject to the same single-use pipe restrictions. An explicit test has been added to ensure the image watcher is not accidentally reintroduced.

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Retaining Image History

Removing the background watcher drops the image history feature. Building a background image clipboard manager on Wayland using purely bash and wl-paste is fundamentally flawed due to the single-use pipe issue. If the project wants to retain image history, here are the architectural alternatives:

1. "Capture on Demand" (Best UX without new dependencies)
Instead of a background watcher, modify Clipboard.qml to read the clipboard only when the user opens the history menu (Super+Ctrl+V).

• Pros: Zero background SSD/CPU thrashing, 100% reliable pasting.
• Cons: It won't keep a historical backlog of every image copied, only the one currently on the clipboard when the menu is opened.

2. Opt-In Toggle
Restore the watcher but put it behind a toggle (e.g. omarchy toggle image-clipboard-history).

• Pros: Preserves the feature for users who rely on it.
• Cons: Leaves a known, confusing bug in the system for anyone who enables it and then tries to paste an image into an affected app.

3. Native Wayland Daemon
Integrate a native Wayland data-control daemon (like cliphist or wl-clip-persist) that is explicitly designed to safely proxy and store clipboard file descriptors without destroying the offer for the user.

• Pros: Perfect UX (background history + reliable pasting).
• Cons: Requires adding and maintaining a new compiled dependency in the Omarchy package set.