fix(tui): re-arm mouse capture on FocusGained

Pre-existing gap exposed during v0.8.24 testing: when the user clicks
away (Cmd+Tab, opens the screenshot tool, etc.) and clicks back, some
terminals drop the application's mouse-tracking mode. The
\`FocusGained\` handler at \`ui.rs::1599\` already re-pushed keyboard
enhancement flags to recover IME state — extend the same recovery to
\`EnableMouseCapture\` so wheel scroll keeps working after a focus
round-trip. Gated on \`app.use_mouse_capture\` so explicit
\`--no-mouse-capture\` users aren't re-enabled against their will.

CHANGELOG.md

@@ -5,13 +5,19 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.8.24] - 2026-05-08
+## [0.8.24] - 2026-05-09
 
 A bugfix + refactor release picking up the backlog after the v0.8.23 security
 release.
 
 ### Fixed
 
+- **Mouse-wheel scroll survives focus toggles** — on macOS, switching away
+  (Cmd+Tab, opening the screenshot tool, etc.) and back can drop the
+  terminal's mouse-tracking mode, leaving wheel scroll dead until restart.
+  The TUI now re-arms `EnableMouseCapture` on `FocusGained` alongside the
+  existing keyboard-mode recapture, so wheel events keep flowing after a
+  focus round-trip.
 - **Workspace-local slash commands are now loaded (#1259)** — user command
   files placed in `<workspace>/.deepseek/commands/`,
   `<workspace>/.claude/commands/`, and `<workspace>/.cursor/commands/` are

crates/tui/src/tui/ui.rs

@@ -1596,8 +1596,14 @@ async fn run_event_loop(
             // terminal's keyboard mode, which breaks IME compositor state.
             // Acknowledging FocusGained and re-pushing the flags restores
             // the IME so CJK input methods work after a focus toggle.
+            // The same reset can drop the terminal's mouse-tracking mode,
+            // leaving wheel scroll dead until restart — re-arm mouse
+            // capture on focus-gain so wheel events keep flowing.
             if terminal_event_needs_viewport_recapture(&evt) {
                 push_keyboard_enhancement_flags(terminal.backend_mut());
+                if app.use_mouse_capture {
+                    let _ = execute!(terminal.backend_mut(), EnableMouseCapture);
+                }
                 force_terminal_repaint = true;
                 app.needs_redraw = true;
             }