feat(ui): improve diff overlay with untracked files, wrapping, and close button

README.md

@@ -36,7 +36,7 @@ Architect solves this with a grid view that keeps all your agents visible, with
 
 ### Terminal Essentials
 - Smooth animated transitions for grid expansion, contraction, and reflow (cells and borders move/resize together)
-- Keyboard navigation: ⌘+Return to expand, ⌘1–⌘0 to switch grid slots, ⌘N to add, ⌘W to close a terminal (restarts if it's the only terminal), ⌘T for worktrees, ⌘O for recent folders, ⌘D for repo-wide git diff (staged + unstaged), ⌘/ for shortcuts; quit with ⌘Q or the window close button
+- Keyboard navigation: ⌘+Return to expand, ⌘1–⌘0 to switch grid slots, ⌘N to add, ⌘W to close a terminal (restarts if it's the only terminal), ⌘T for worktrees, ⌘O for recent folders, ⌘D for repo-wide git diff (staged + unstaged + untracked), ⌘/ for shortcuts; quit with ⌘Q or the window close button
 - Git diff overlay title shows the repo root folder being diffed
 - Per-cell cwd bar in grid view with reserved space so terminal content stays visible
 - Scrollback with trackpad/wheel support and grid indicator when scrolled

src/app/runtime.zig

@@ -1826,8 +1826,11 @@ pub fn run() !void {
                     sessions[anim_state.focused_session].cwd_path
                 else
                     null;
-                diff_overlay_component.toggle(focused_cwd, now);
-                if (config.ui.show_hotkey_feedback) ui.showHotkey("⌘D", now);
+                switch (diff_overlay_component.toggle(focused_cwd, now)) {
+                    .not_a_repo => ui.showToast("Not a git repository", now),
+                    .clean => ui.showToast("Working tree clean", now),
+                    .opened => if (config.ui.show_hotkey_feedback) ui.showHotkey("⌘D", now),
+                }
             },
         };