fix(FN-1851): make GitManager remotes tab scrollable on mobile

- Add overflow-y: auto and max-height to remotes tab panel for mobile scrolling
- Add test to verify GitManager modal remotes panel is scrollable at mobile widths
- Ensures remotes content is accessible on small screens without overflow issues

packages/dashboard/app/components/__tests__/core-modals-mobile.test.tsx

@@ -102,6 +102,14 @@ describe("core modals mobile css coverage", () => {
     expect(mobileBlock).toContain("min-height: 36px;");
   });
 
+  it("GitManagerModal: panel allows content scrolling on mobile", () => {
+    const css = fs.readFileSync(stylesPath, "utf-8");
+    const mobileBlock = getMainMobileBlock(css);
+
+    expect(mobileBlock).toContain(".gm-panel {");
+    expect(mobileBlock).toContain("overflow-y: auto;");
+  });
+
   it("TaskDetailModal: action dropdown menus have max-height constraint on mobile", () => {
     const css = fs.readFileSync(stylesPath, "utf-8");
     const mobileBlock = getMainMobileBlock(css);