Apply breakpoint-aware layout to issue_detail and mr_detail views:
- Issue detail: hide labels on Xs, hide assignees on Xs/Sm, skip milestone row on Xs
- MR detail: hide branch names and merge status on Xs/Sm
- Issue detail allocate_sections gives description 60% on wide (Lg+) vs 40% narrow
- Add responsive tests for both detail views
- Close bd-a6yb: all TUI screens now adapt to terminal width
760 lib tests pass, clippy clean.
Four view modules (search, command_palette, file_history, trace) each had
their own copy of cursor_cell_offset / text_cell_width for converting a
byte-offset cursor position to a display-column offset. Phase 5 introduced
a proper text_width module with these functions; this commit removes the
duplicates and rewires all call sites to use crate::text_width.
- search.rs: removed local text_cell_width + cursor_cell_offset definitions
- command_palette.rs: removed local cursor_cell_offset definition
- file_history.rs: replaced inline chars().count() cursor calc with import
- trace.rs: replaced inline chars().count() cursor calc with import
Complete TUI Phase 3 implementation with all 5 power feature screens:
- Who screen: 5 modes (expert/workload/reviews/active/overlap) with
mode tabs, input bar, result rendering, and hint bar
- Search screen: full-text search with result list and scoring display
- Timeline screen: chronological event feed with time-relative display
- Trace screen: file provenance chains with expand/collapse, rename
tracking, and linked issues/discussions
- File History screen: per-file MR timeline with rename chain display
and discussion snippets
Also includes:
- Command palette overlay (fuzzy search)
- Bootstrap screen (initial sync flow)
- Action layer split from monolithic action.rs to per-screen modules
- Entity and render cache infrastructure
- Shared who_types module in core crate
- All screens wired into view/mod.rs dispatch
- 597 tests passing, clippy clean (pedantic + nursery), fmt clean
