Removes perceived delay on initial watch face transfers

[garanj]

When transferring a watch face, the Send to Watch button appears to freeze, particularly on first use, before transitioning to the Sending to Watch state.

This is because before sending the watch face, the background is removed with:

imageGenerationRepository.removeBackground(bitmap)

which can take a little time to initialize, if it hasn't been called before.

This PR adds a new watch face transmission state: PREPARING. The send button is updated to reflect being in the PREPARING state immediately, so removing the user perception that the transmission has hung.

Also a small number of other unrelated files have been modified as a result of running Spotless.

[gemini-code-assist]

Summary of Changes

Hello @garanj, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the user experience for watch face transfers by addressing a perceived delay that occurred during the initial processing phase. By introducing a distinct "Preparing" state, the application now provides immediate visual feedback to the user, eliminating the impression of unresponsiveness and clearly communicating the ongoing background operations before the actual transfer begins.

Highlights

• Enhanced User Feedback: Introduced a new "PREPARING" state during watch face transfers to provide immediate visual feedback, preventing the perception of the application freezing during initial processing.
• Unified Transfer UI: Replaced the dedicated SendingWatchFacePanel with a more generic TransferringWatchFacePanel to handle both the PREPARING and SENDING states, improving UI consistency and reusability.
• Background Processing Indication: The imageGenerationRepository.removeBackground operation, which can cause initial delays, is now preceded by the PREPARING state, making the UI more responsive and transparent about ongoing background tasks.
• Code Formatting: Minor formatting adjustments were applied across several files due to running Spotless, ensuring consistent code style.

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[gemini-code-assist]

Code Review

This pull request effectively addresses the perceived UI freeze during watch face transfers by introducing a new PREPARING state. The implementation is solid, correctly updating the view model to emit this state before the background removal process and refactoring the UI to display it. The consolidation of SendingWatchFacePanel into a more generic TransferringWatchFacePanel is a good architectural improvement. I've identified a couple of issues in the new TransferringWatchFacePanel.kt file regarding its file path and a misuse of modifiers that should be corrected.

[garanj]

Build broke because the enumeration is also used on the watch side, but use of this in when { } statements was no longer exhaustive.