fix(tui/mcp): keep menu selection in view

[zemaj]

Summary

• track the rendered line index of the selected MCP menu row
• compute a scroll offset and apply it via Paragraph::scroll so the highlight stays visible
• no other behavior changes; still respects empty state and footer hints

Testing

• ./build-fast.sh

Fixes #305

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Align cursor with mtime-based ordering

Traversal now ranks conversations by filesystem modification time, but the pagination cursor and skip logic still compare only the timestamp encoded in the filename. The loop marks anchor_passed once it sees a record with ts < anchor_ts; any files with a newer timestamp but an older mtime are skipped before this happens and will never be yielded on subsequent pages. For example, with three files (mtime 20, ts Aug), (mtime 15, ts Jul), (mtime 10, ts Sep), requesting the Aug entry first means the Sep session can never appear on later pages. Pagination will drop or reorder sessions unless the cursor also tracks the mtime (or the anchor filter is applied after sorting by mtime).

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[zemaj]

Preview Build rerun triggered after #364 merged; watching for green checks.

[zemaj]

Fresh Preview Build queued with updated toolchain after #364 merged; watching for green checks.

[zemaj]

Preview Build rerun queued with Rust 1.90.0 plus MUSL targets after #370 merged. Tracking run: https://github.com/just-every/code/actions/runs/18870471268