fix(console): hover preview swaps rows immediately on cache miss

[alob-mtc]

Bug: hovering a different row while the popup was already showing left the OLD row's content visible until the standard 2s timer fired AND the new row's fetch resolved. Worst case ~2s + network — the popup looked broken (showing data unrelated to the row the cursor was on).

Cause

The swap path in `onRowMouseEnter` only updated the popup state when the new row's result was already cached. Cache miss fell through to the cold-path "schedule a 2s timer" branch — the popup didn't change in the meantime.

Fix

On row swap, always update the popup's row + input immediately:

• Cache hit → render with cached result.
• Cache miss → render with `result: null` (popup briefly shows "No result yet" while the activity loads) and patch in the actual result when the background fetch returns.

Seq guard ensures a slow fetch can't override a row the user already moved past.

Also guards re-entry into the same row: cancels the show timer but doesn't tear down or replace the existing popup.

Note on history

This change was originally pushed directly to `main` as commit `abd2794` by mistake. Force-pushed main back to `1d560e3` and re-applied here as a proper PR.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 305105d1-a566-40c1-95ab-be7b497971d6

📥 Commits

Reviewing files that changed from the base of the PR and between 1d560e3 and abd2794.

📒 Files selected for processing (1)

• observability/ui/runnerq-console.html

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/console-hover-preview-row-swap

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