feat(desktop): add upload indicator for audio file uploads

[devin-ai-integration]

feat(desktop): add upload indicator for audio file uploads

Summary

Adds visual feedback when uploading audio files in the desktop app. Previously, clicking "Upload audio" would show no indication that anything was happening, leaving users confused about whether the upload was in progress.

Changes:

• Added isUploading state to track upload progress
• Added check for isBatchProcessing from listener store to track batch transcription
• Shows spinning loader icon instead of ellipsis menu icon during processing
• Displays tooltip with "Uploading audio..." or "Processing audio..." status
• Disables the options menu button during processing to prevent duplicate uploads

Review & Testing Checklist for Human

• Test the upload flow end-to-end: Select an audio file and verify the loading indicator appears immediately and persists until processing completes
• Test with no STT provider configured: The underlying useRunBatch hook returns early with only a console.error if no STT connection exists - verify the indicator still disappears and consider if user-facing error feedback is needed
• Test canceling the file dialog: Ensure the loading state doesn't get stuck if user cancels file selection
• Verify batch processing indicator: When batch transcription is running, the indicator should show "Processing audio..."

Test Plan

1. Open a session in the desktop app
2. Click the ellipsis menu button on the floating action button
3. Click "Upload audio" and select an audio file
4. Verify: Loading spinner appears with "Uploading audio..." tooltip
5. Verify: After upload completes, spinner changes to "Processing audio..." during batch transcription
6. Verify: Button returns to normal state after processing completes

Notes

• This PR adds the visual indicator but does not change the underlying upload/batch processing logic
• If uploads are failing silently due to missing STT configuration, users will now at least see the indicator disappear (though no error message is shown)

Requested by: @ComputelessComputer

Link to Devin run: https://app.devin.ai/sessions/633f74198e174d3a98cbc10d15df39c7

[devin-ai-integration]

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