feat: add Apply Patch tool with patch input and diff view (#196)

* feat: add Apply Patch tool with patch input and diff view

Introduce Apply Patch tool with a patch input field and diff preview
Display target file path or file count for patch operations in tool UI
Update status label to show applying patch during execution

* fix: include apply_patch in editing tools detection

packages/ui/src/hooks/useAssistantStatus.ts

@@ -169,7 +169,7 @@ export function useAssistantStatus(): AssistantStatusSnapshot {
         let activePartType: 'text' | 'tool' | 'reasoning' | 'editing' | undefined = undefined;
         let activeToolName: string | undefined = undefined;
 
-        const editingTools = new Set(['edit', 'write']);
+        const editingTools = new Set(['edit', 'write', 'apply_patch']);
 
         for (let i = (lastAssistant.parts ?? []).length - 1; i >= 0; i -= 1) {
             const part = lastAssistant.parts?.[i];
@@ -218,6 +218,7 @@ export function useAssistantStatus(): AssistantStatusSnapshot {
             write: 'writing file',
             edit: 'editing file',
             multiedit: 'editing files',
+            apply_patch: 'applying patch',
             bash: 'running command',
             grep: 'searching content',
             glob: 'finding files',