## Why
Pasting during `Ctrl+R` history search previously went through normal composer paste handling instead of updating the search query.
## What changed
- Append sanitized pasted text to the active query and restart matching from the newest history entry, including for large pastes and image paths.
- Ignore empty pastes so they preserve the selected match.
- Display newlines and tabs as `↵` and `⇥` in the footer while matching the original query, and clamp the cursor safely for very large queries.
## Testing
Add regression tests and snapshots covering pasted query acceptance, empty pastes, draft restoration on misses and cancellation, sanitization, large pastes, image paths, separator rendering, and cursor placement.
GitOrigin-RevId: 2ec13fdddcb7503a72a21fc03b2a27ed36313a8a
a505c71490