feat(tui2): add multi-click transcript selection (#8471)

Support multi-click transcript selection using transcript/viewport
coordinates
(wrapped visual line index + content column), not terminal buffer
positions.

Gestures:
- double click: select word-ish token under cursor
- triple click: select entire wrapped line
- quad click: select paragraph (contiguous non-empty wrapped lines)
- quint+ click: select the entire history cell (all wrapped lines
belonging to a
  single `HistoryCell`, including blank lines inside the cell)

Selection expansion rebuilds the wrapped transcript view from
`HistoryCell::display_lines(width)` so boundaries match on-screen
wrapping during
scroll/resize/streaming reflow. Click grouping is resilient to minor
drag jitter
(some terminals emit tiny Drag events during clicks) and becomes more
tolerant as
the sequence progresses so quad/quint clicks are practical.

Tests cover expansion (word/line/paragraph/cell), sequence resets
(timing, motion,
line changes, real drags), drag jitter, and behavior on spacer lines
between
history cells (paragraph/cell selection prefers the cell above).

codex-rs/tui2/src/lib.rs

@@ -78,6 +78,9 @@ mod terminal_palette;
 mod text_formatting;
 mod tooltips;
 mod transcript_copy;
+mod transcript_copy_ui;
+mod transcript_multi_click;
+mod transcript_render;
 mod transcript_selection;
 mod tui;
 mod ui_consts;