feat(glyphs): toggle every glyph slot between none and default with Shift+Tab

docs/USAGE.md

@@ -273,7 +273,7 @@ Widget picker:
 The keybind footer in the TUI only shows shortcuts that apply to the currently selected widget. Plain-letter shortcuts ignore Ctrl and Alt/Option modifiers, so combinations such as `Ctrl+S` do not also trigger the letter action.
 
 Widget-specific shortcuts:
-- **Glyph widgets** (Git Branch, Git Worktree, Git Worktree Mode, Git Staged, Git Unstaged, Git Untracked, Git Conflicts, Git Ahead/Behind, Git Status, Git Changes, Git Insertions, Git Deletions, Git Clean Status, Git Is Fork, JJ Revision, JJ Bookmarks, JJ Workspace, JJ Changes, JJ Insertions, JJ Deletions): `g` set custom glyphs for the widget's symbols; Backspace in the editor renders without one, and multi-symbol widgets (Ahead/Behind, Status, Conflicts, Changes, Clean Status) edit each part in one list
+- **Glyph widgets** (Git Branch, Git Worktree, Git Worktree Mode, Git Staged, Git Unstaged, Git Untracked, Git Conflicts, Git Ahead/Behind, Git Status, Git Changes, Git Insertions, Git Deletions, Git Clean Status, Git Is Fork, JJ Revision, JJ Bookmarks, JJ Workspace, JJ Changes, JJ Insertions, JJ Deletions): `g` set custom glyphs for the widget's symbols; Backspace in the editor renders without one, Shift+Tab toggles every symbol between none and default, and multi-symbol widgets (Ahead/Behind, Status, Conflicts, Changes, Clean Status) edit each part in one list
 - **Git Branch**: `l` toggle clickable branch links (GitHub, GitLab, self-hosted), `w` set a maximum visible width (blank removes the limit)
 - **Git Root Dir**: `l` cycle IDE links (`off` → `VS Code` → `Cursor`), `w` set a maximum visible width (blank removes the limit)
 - **Git PR**: `s` toggle review status, `t` toggle title (renders "MR" for GitLab origins)

src/widgets/shared/__tests__/symbol-override-editor.test.tsx

@@ -157,4 +157,69 @@ describe('SymbolSlotsEditor', () => {
             cleanupEditor(rendered);
         }
     });
+
+    it('blanks every slot on Shift+Tab', async () => {
+        const rendered = renderEditor({ id: 'git-status', type: 'git-status' });
+
+        try {
+            await waitFor(() => {
+                expect(rendered.stdout.getOutput()).toContain('Conflicts:');
+            });
+            // Any new frame after Shift+Tab means the toggle was handled
+            rendered.stdout.clearOutput();
+            rendered.stdin.write('\x1B[Z');
+            await waitFor(() => {
+                expect(rendered.stdout.getOutput()).toContain('Conflicts:');
+            });
+            rendered.stdin.write('\r');
+            await waitFor(() => {
+                expect(rendered.onComplete).toHaveBeenCalledTimes(1);
+            });
+
+            const updated = rendered.onComplete.mock.calls[0]?.[0] as WidgetItem | undefined;
+            expect(updated?.metadata).toEqual({
+                symbolConflicts: '',
+                symbolStaged: '',
+                symbolUnstaged: '',
+                symbolUntracked: ''
+            });
+        } finally {
+            cleanupEditor(rendered);
+        }
+    });
+
+    it('restores every default on a second Shift+Tab', async () => {
+        const rendered = renderEditor({
+            id: 'git-status',
+            type: 'git-status',
+            metadata: {
+                symbolConflicts: '',
+                symbolStaged: '',
+                symbolUnstaged: '',
+                symbolUntracked: ''
+            }
+        });
+
+        try {
+            await waitFor(() => {
+                expect(rendered.stdout.getOutput()).toContain('Conflicts:');
+            });
+            // Any new frame after Shift+Tab means the toggle was handled
+            rendered.stdout.clearOutput();
+            rendered.stdin.write('\x1B[Z');
+            await waitFor(() => {
+                expect(rendered.stdout.getOutput()).toContain('Conflicts:');
+            });
+            rendered.stdin.write('\r');
+            await waitFor(() => {
+                expect(rendered.onComplete).toHaveBeenCalledTimes(1);
+            });
+
+            // Every slot back at its default stores no overrides at all.
+            const updated = rendered.onComplete.mock.calls[0]?.[0] as WidgetItem | undefined;
+            expect(updated?.metadata).toBeUndefined();
+        } finally {
+            cleanupEditor(rendered);
+        }
+    });
 });

src/widgets/shared/symbol-override.tsx

@@ -103,6 +103,12 @@ const SymbolSlotsEditor: React.FC<WidgetEditorProps & { slots: SymbolSlot[] }> =
             setSelectedIndex(selectedIndex - 1 < 0 ? slots.length - 1 : selectedIndex - 1);
         } else if (key.downArrow && slots.length > 1) {
             setSelectedIndex(selectedIndex + 1 > slots.length - 1 ? 0 : selectedIndex + 1);
+        } else if (key.tab && key.shift) {
+            // Widgets with several glyphs are mostly blanked whole to save
+            // width on the status line, which is one Backspace per row
+            // otherwise. Blanked rows toggle back so the key is reversible.
+            const allBlank = values.every(value => value.length === 0);
+            setValues(values.map((_, index) => (allBlank ? slots[index]?.defaultSymbol ?? '' : '')));
         } else if (key.tab) {
             setValues(values.map((value, index) => (
                 index === selectedIndex ? slots[selectedIndex]?.defaultSymbol ?? '' : value
@@ -121,7 +127,7 @@ const SymbolSlotsEditor: React.FC<WidgetEditorProps & { slots: SymbolSlot[] }> =
             <Text bold>Glyphs</Text>
             <Text dimColor>
                 {slots.length > 1
-                    ? '↑↓ row, type to set, Tab default, Backspace none, Enter save, ESC cancel'
+                    ? '↑↓ row, type to set, Tab default, Backspace none, Shift+Tab toggle all none/default, Enter save, ESC cancel'
                     : 'Type any character or emoji, Tab default, Backspace none, Enter save, ESC cancel'}
             </Text>
             <Box marginTop={1} flexDirection='column'>