🎨 Palette: Add loading spinner to CommentsPanel post button

[aarjava]

💡 What: Added a loading spinner (Loader2) and changed button text to "Posting..." in the CommentsPanel while an async request is processing.
🎯 Why: Without visual feedback, users clicking the 'Post' button may feel the app is unresponsive. Providing an immediate visual state transition clarifies that their action is being processed.
📸 Before/After: Before, the button became gray and inactive. Now, it displays an animated spinning loader and "Posting...".
♿ Accessibility: Added aria-busy={loading ? 'true' : undefined} to correctly announce the busy state to assistive technologies, and aria-hidden="true" to the decorative spinner icon.

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PR created automatically by Jules for task 16907976060571062622 started by @aarjava

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Project	Deployment	Actions	Updated (UTC)
fluxlens-ai	Ready	Preview, Comment	Mar 29, 2026 11:13pm