fix: add focus mode keyboard shortcut (Ctrl+Shift+F)

Bind Ctrl+Shift+F to Workspace.ToggleFocusMode which previously had
no default keybinding.

src/platform/keybindings/defaults.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest'
+
+import { CORE_KEYBINDINGS } from '@/platform/keybindings/defaults'
+
+describe('CORE_KEYBINDINGS', () => {
+  it('should include Workspace.ToggleFocusMode bound to Ctrl+Shift+F', () => {
+    const binding = CORE_KEYBINDINGS.find(
+      (kb) => kb.commandId === 'Workspace.ToggleFocusMode'
+    )
+
+    expect(binding).toBeDefined()
+    expect(binding!.combo).toEqual({
+      key: 'f',
+      ctrl: true,
+      shift: true
+    })
+  })
+})

src/platform/keybindings/defaults.ts

@@ -208,5 +208,13 @@ export const CORE_KEYBINDINGS: Keybinding[] = [
       key: 'Escape'
     },
     commandId: 'Comfy.Graph.ExitSubgraph'
+  },
+  {
+    combo: {
+      key: 'f',
+      ctrl: true,
+      shift: true
+    },
+    commandId: 'Workspace.ToggleFocusMode'
   }
 ]