fix(web): open files from Claude and ACP tool-call diffs

apps/web/src/diffFileActions.test.ts

@@ -69,23 +69,45 @@ describe("openDiffFilePrimaryAction", () => {
     ).toBe("index.ts");
   });
 
-  it.each(["backend/server.ts", "frontend2/app.ts", "frontend/../secret.ts", "C:secret.ts"])(
-    "does not open an out-of-project diff path: %s",
-    (filePath) => {
-      const openInEditor = vi.fn();
-
-      openDiffFilePrimaryAction({
-        threadRef: THREAD_REF,
-        filePath,
-        activeCwd: "/repo/frontend",
-        repositoryRoot: "/repo",
-        openInEditor,
-      });
-
+  it.each([
+    {
+      filePath: "/repo/frontend/src/index.ts",
+      workspaceRoot: "/repo/frontend",
+      expected: "src/index.ts",
+    },
+    { filePath: "c:\\Repo\\src\\index.ts", workspaceRoot: "C:\\repo", expected: "src/index.ts" },
+  ])(
+    "opens absolute diff paths inside the workspace: $filePath",
+    ({ filePath, workspaceRoot, expected }) => {
       expect(
-        selectThreadRightPanelState(useRightPanelStore.getState().byThreadKey, THREAD_REF),
-      ).toMatchObject({ isOpen: false });
-      expect(openInEditor).not.toHaveBeenCalled();
+        resolveDiffPathForWorkspace({ filePath, workspaceRoot, repositoryRoot: workspaceRoot }),
+      ).toBe(expected);
     },
   );
+
+  it.each([
+    "backend/server.ts",
+    "frontend2/app.ts",
+    "frontend/../secret.ts",
+    "C:secret.ts",
+    "/repo/backend/server.ts",
+    "/repo/frontend/../backend/server.ts",
+    "/repo/frontend",
+    "/etc/passwd",
+  ])("does not open an out-of-project diff path: %s", (filePath) => {
+    const openInEditor = vi.fn();
+
+    openDiffFilePrimaryAction({
+      threadRef: THREAD_REF,
+      filePath,
+      activeCwd: "/repo/frontend",
+      repositoryRoot: "/repo",
+      openInEditor,
+    });
+
+    expect(
+      selectThreadRightPanelState(useRightPanelStore.getState().byThreadKey, THREAD_REF),
+    ).toMatchObject({ isOpen: false });
+    expect(openInEditor).not.toHaveBeenCalled();
+  });
 });

apps/web/src/diffFileActions.ts

@@ -1,5 +1,10 @@
 import type { ScopedThreadRef } from "@t3tools/contracts";
-import { isWindowsAbsolutePath, normalizeProjectPathForComparison } from "@t3tools/shared/path";
+import {
+  isAbsolutePath,
+  isWindowsAbsolutePath,
+  normalizeProjectPathForComparison,
+  workspaceRelativeFilePath,
+} from "@t3tools/shared/path";
 
 import { useRightPanelStore } from "./rightPanelStore";
 import { resolvePathLinkTarget } from "@t3tools/shared/fileLinks";
@@ -52,6 +57,13 @@ export function resolveDiffPathForWorkspace(input: {
   readonly workspaceRoot: string | undefined;
   readonly repositoryRoot: string | undefined;
 }): string | null {
+  // Claude and ACP tool-call diffs name files by absolute path.
+  if (isAbsolutePath(input.filePath)) {
+    const relativePath = workspaceRelativeFilePath(input.filePath, input.workspaceRoot);
+    const segments = relativePath === null ? null : normalizedRelativePathSegments(relativePath);
+    return segments ? segments.join("/") : null;
+  }
+
   const fileSegments = normalizedRelativePathSegments(input.filePath);
   if (!fileSegments) return null;