Adds estimated export time and file size indicators directly under the export buttons to resolve #224.

Changes

• Added size (MB) and duration (sec/min) estimation text below the main export button in ExportPage.tsx.
• Added estimated size and time badge to thumbnail hover cards in recordings-overlay.tsx.

Tested locally with short and long recording lengths.

/claim #224

Greptile Summary

This PR adds estimated export size and duration text to the editor export action and recording-thumbnail hover cards.

Confidence Score: 4/5

The PR appears safe to merge, with a non-blocking readability issue for long duration estimates in the recording overlay.

The estimate units and guarded data access are consistent with their producers, but the overlay’s seconds-only formatting becomes difficult to interpret for long recordings.

Files Needing Attention: apps/desktop/src/routes/recordings-overlay.tsx

Important Files Changed

### Issue 1
apps/desktop/src/routes/recordings-overlay.tsx:388
**Format long estimates readably**

The badge renders every `estimatedExportTime` value as raw seconds, so long recordings display values such as `~10800s` instead of the more readable minutes-and-seconds format used by the main export view.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

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