feat: show tooltip on error icon button in summary tab

[devin-ai-integration]

Summary

When summary generation fails, a red CircleAlert icon now appears next to the Summary tab label. Hovering over it shows a tooltip with the error message explaining why generation failed. Clicking the icon triggers regeneration (same as the existing refresh button).

The trailing element priority order was also reorganized: spinning indicator → error icon with tooltip → refresh button → null.

Review & Testing Checklist for Human

• Trigger a summary generation error and verify the red error icon appears in the Summary tab with the correct tooltip text
• Verify the error icon is visible regardless of which tab (Summary/Memos/Transcript) is active — the error icon intentionally does not check activeTab === "summary", unlike the refresh button
• Confirm clicking the error icon triggers summary regeneration and the icon transitions to the spinner
• Check that the tooltip is readable for long error messages (content is capped at max-w-[240px] — verify long messages don't get cut off awkwardly without ellipsis)

Notes

• Requested by: @ComputelessComputer
• Devin run

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[devin-ai-integration]

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