umputun / revdiff / 24798272250

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Add mouse support (#142)

* add plan: mouse-support

* feat: add --no-mouse config flag and wire tea.WithMouseCellMotion

Adds the NoMouse option (CLI flag, env var, ini) following the existing
no-* flag pattern. When not set, tea.WithMouseCellMotion() is appended
to program options so future handleMouse work can observe wheel and
click events. Defaults preserve current behavior modulo mouse tracking,
which will start flowing through Update() once the handler lands.

* feat: add visualRowToDiffLine inverse mapping for click-to-cursor

Inverse of cursorVisualRange: given a visual row within the diff viewport
content, returns the diff-line index and whether the row lies on an
injected annotation sub-line. Handles file-level annotations (idx=-1),
wrapped rows, collapsed-mode hidden lines, and out-of-bounds rows.

Foundation for mouse click-to-cursor in the diff pane.

* feat: add SelectByVisibleRow to FileTree and TOC

Maps a visible screen row (0-based from the first rendered line)
to an entry index via the pane's internal offset, returning false
for out-of-bounds rows without touching the cursor.

Unlocks click-to-select once the mouse handler arrives.

* feat: add hitTest and layout helpers for mouse routing

Introduce hitZone classification (hitNone/hitTree/hitDiff/hitStatus/hitHeader)
with Model.hitTest(x, y) dispatching screen coordinates to the right pane.
Add statusBarHeight, diffTopRow, treeTopRow methods as the single source of
truth for layout math. Tree block spans treeWidth+2 columns (including
borders), diff picks up at treeWidth+2.

* feat: route tea.MouseMsg through handleMouse for wheel and left-click

Wire bubbletea mouse events into the Model via a new tea.MouseMsg case in
Update. handleMouse clears transient hints, swallows input during modal
states (annotating, searching, pending reload, confirm discard, overlay
open), and dispatches on button:

- wheel up/down: routes to pane under the pointer (not the focused pane).
  Shift+wheel s... (continued)

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