- Add `place_cursor_x(inner_x, inner_width, prompt_w, cursor_col) -> u16`
to `input.rs`: sums in `usize` (no u16 wrap), clamps to inner right
edge, tries_into with u16::MAX fallback. Two unit tests pin the clamp
and the in-bounds path.
- Re-export from `lib.rs` alongside `InputBuffer`, `display_width`,
`truncate_to_display_width`.
- Replace the open-coded 2-line `raw_x`/`cursor_x` blocks in Search,
Ask, and Library with a single `place_cursor_x` call each —
consistent usize arithmetic across all three panes.
- Add `filter_overlay_render_places_cursor_on_focused_field` integration
test in `tests/library.rs`: opens the filter overlay, renders through
`TestBackend`, asserts `terminal.get_cursor_position().x > 0` (label
offset > 0 proves `set_cursor_position` was called with a meaningful
coordinate, not stuck at origin).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>