FN-5711: stack mission list items and actions on mobile

Improve the mission manager mobile stacked layout so mission rows reflow cleanly.

- make stacked mission list items switch to column layout with stretched content on mobile
- make stacked mission item actions full-width and wrapping instead of cramped inline controls
- make stacked mission run controls span full width
- add mobile CSS regression assertions for stacked-body mission cards and action controls

Files changed:
 packages/dashboard/app/components/MissionManager.css     | 16 ++++++++++++++++
 packages/dashboard/app/components/__tests__/MissionManager.mobile-css.test.ts | 13 +++++++++++++
 2 files changed, 29 insertions(+)

Fusion-Task-Id: FN-5711

Fusion-Task-Lineage: 76a20899-89fe-4aa9-8871-6b64c2521a0b

packages/dashboard/app/components/MissionManager.css

@@ -2546,6 +2546,22 @@
     padding: var(--space-md);
   }
 
+  .mission-manager__body--stacked .mission-list__item {
+    flex-direction: column;
+    align-items: stretch;
+    gap: var(--space-sm);
+  }
+
+  .mission-manager__body--stacked .mission-list__item-actions {
+    width: 100%;
+    flex-wrap: wrap;
+    justify-content: flex-start;
+  }
+
+  .mission-manager__body--stacked .mission-list__item-run-controls {
+    width: 100%;
+  }
+
   .mission-manager__body--stacked .mission-list__item-description,
   .mission-manager__body--stacked .mission-list__item-description .markdown-body {
     display: -webkit-box;

packages/dashboard/app/components/__tests__/MissionManager.mobile-css.test.ts

@@ -51,6 +51,19 @@ describe("MissionManager mobile styles", () => {
     expect(section).toContain("-webkit-line-clamp: 2;");
   });
 
+  it("stacks stacked-body mission cards and actions on mobile", () => {
+    const css = loadAllAppCss();
+    const section = getMissionMobileSection(css);
+
+    expect(section).toContain(".mission-manager__body--stacked .mission-list__item {");
+    expect(section).toContain("flex-direction: column;");
+    expect(section).toContain("align-items: stretch;");
+    expect(section).toContain(".mission-manager__body--stacked .mission-list__item-actions {");
+    expect(section).toContain("width: 100%;");
+    expect(section).toContain("flex-wrap: wrap;");
+    expect(section).toContain(".mission-manager__body--stacked .mission-list__item-run-controls {");
+  });
+
   it("keeps mission detail mobile bottom padding content-only (no shared nav duplication)", () => {
     const css = loadAllAppCss();
     const section = getMissionMobileSection(css);