feat: add workspace files to chat from Files and Changes

* feat(app): open changed files from context menu

* fix(app): preserve changed-file row behavior

* feat(app): add changed files to open chats

* feat(app): share file actions across explorer and changes

* feat(app): attach workspace files to focused chat

* feat(app): drag workspace files into chat

* refactor(app): use file actions menu for changed files

* fix(app): open changed-file actions on right click

* test(app): cover direct file attachment flow

* fix(app): enable add to chat on native

* fix(app): align workspace file pane rows

* refactor(app): simplify workspace file attachments

* fix(app): preserve uploaded file draft attachments

---------

Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/app/src/utils/file-mention-autocomplete.test.ts

@@ -1,5 +1,9 @@
 import { describe, expect, it } from "vitest";
-import { applyFileMentionReplacement, findActiveFileMention } from "./file-mention-autocomplete";
+import {
+  applyFileMentionReplacement,
+  findActiveFileMention,
+  formatQuotedFileMentionPath,
+} from "./file-mention-autocomplete";
 
 describe("findActiveFileMention", () => {
   it("detects mentions at the start of input", () => {
@@ -46,6 +50,14 @@ describe("findActiveFileMention", () => {
   });
 });
 
+describe("formatQuotedFileMentionPath", () => {
+  it("quotes workspace-relative paths using file mention escaping", () => {
+    expect(formatQuotedFileMentionPath('src/changed "file".ts')).toBe(
+      '"src/changed \\"file\\".ts"',
+    );
+  });
+});
+
 describe("applyFileMentionReplacement", () => {
   it("replaces only the active @query segment with a quoted relative path", () => {
     const text = "open @src/com next";

packages/app/src/utils/file-mention-autocomplete.ts

@@ -40,9 +40,13 @@ export function findActiveFileMention(input: FindActiveFileMentionInput): FileMe
   return null;
 }
 
+export function formatQuotedFileMentionPath(relativePath: string): string {
+  const safePath = relativePath.replace(/"/g, '\\"');
+  return `"${safePath}"`;
+}
+
 export function applyFileMentionReplacement(input: ApplyFileMentionReplacementInput): string {
-  const safePath = input.relativePath.replace(/"/g, '\\"');
   const before = input.text.slice(0, input.mention.start);
   const after = input.text.slice(input.mention.end);
-  return `${before}"${safePath}"${after}`;
+  return `${before}${formatQuotedFileMentionPath(input.relativePath)}${after}`;
 }