## Why
Paginated sessions can have visible messages beyond the first item page, so
bounded hydration could leave resumed history or transcript previews empty and
the transcript viewer incomplete.
## What changed
- Scan paginated history until the configured rendered-row budget is filled,
while retaining the configured scrollback beyond the visible viewport.
- Fully hydrate transcripts opened from the resume picker and build previews
from bounded item pages, including when non-visible items precede messages.
- Stop pagination on repeated cursors and let `Esc` cancel an in-flight
transcript load.
- Replay restored token usage for cold metadata-only resumes when its stored
turn can be identified.
## Testing
- Add coverage for paginated and legacy transcript loading, bounded resume
hydration, repeated cursors, transcript cancellation, and resize reflow.
GitOrigin-RevId: 2ce69f7d5eae88e2b09a27c333b00b1830ff17bf
Felipe Coury
3b8d22ec2c