feat(FN-3367): fix Git Manager mobile changes overflow

- Add mobile-only Git Manager layout rules so changes lists and sections can shrink without horizontal page scrolling
- Wrap section header actions and file rows at narrow widths while preserving readable file names and controls
- Extend GitManagerModal CSS regression coverage for mobile wrapping selectors
- Add core mobile modal test assertions for wrapped actions/rows and bounded section width
- Add a patch changeset for @runfusion/fusion documenting the mobile overflow fix

Fusion-Task-Id: FN-3367

packages/dashboard/app/components/ScriptsModal.css

@@ -3350,6 +3350,60 @@
 /* ── Responsive ── */
 
 @media (max-width: 768px) {
+  .gm-changes-split {
+    grid-template-columns: 1fr;
+  }
+
+  .gm-changes-lists {
+    min-width: 0;
+    max-width: 100%;
+  }
+
+  .gm-file-section {
+    min-width: 0;
+    max-width: 100%;
+  }
+
+  .gm-file-section-header {
+    flex-wrap: wrap;
+    gap: var(--space-sm);
+  }
+
+  .gm-file-section-header h5 {
+    min-width: 0;
+    flex: 1 1 auto;
+  }
+
+  .gm-file-section-actions {
+    flex: 1 1 100%;
+    flex-wrap: wrap;
+    min-width: 0;
+    justify-content: flex-start;
+  }
+
+  .gm-file-section-actions .btn {
+    flex: 1 1 auto;
+    min-width: 0;
+  }
+
+  .gm-file-item {
+    min-width: 0;
+    flex-wrap: wrap;
+    row-gap: var(--space-xs);
+  }
+
+  .gm-file-checkbox,
+  .gm-file-icon,
+  .gm-file-badge,
+  .gm-file-item .gm-icon-btn {
+    flex: 0 0 auto;
+  }
+
+  .gm-file-name {
+    flex: 1 1 auto;
+    min-width: 0;
+  }
+
   .gm-remotes-layout {
     grid-template-columns: 1fr;
   }