Add loading spinner when refreshing plan status

[devin-ai-integration]

Summary

Adds a loading spinner to provide visual feedback when clicking "here" to refresh plan status in the App Settings. Previously, clicking the link had no visual indication that anything was happening, making the UI feel unresponsive.

Changes:

• Added isRefreshingPlan state to track the refresh operation
• Created handleRefreshPlan callback that wraps auth.refreshSession() with loading state management
• Shows a spinner with "Refreshing plan status..." text while the refresh is in progress

Review & Testing Checklist for Human

• Verify the spinner appears immediately when clicking "here" in Settings > App > Plan & Billing
• Confirm the spinner disappears and original text returns after refresh completes
• Check that the layout looks correct (no visual glitches with the flex container)

Test plan: Open the app, go to Settings, navigate to the App tab, and click "here" to refresh plan status. The spinner should appear during the refresh operation.

Notes

• Link to Devin run: https://app.devin.ai/sessions/c84c0c4ba1dc4fc2ab704adeb4d92ee1
• Requested by: @ComputelessComputer

[devin-ai-integration]

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