diff --git a/frontend/src/v2/__tests__/v2-phone-shell.test.ts b/frontend/src/v2/__tests__/v2-phone-shell.test.ts
new file mode 100644
index 000000000..3d75a0287
--- /dev/null
+++ b/frontend/src/v2/__tests__/v2-phone-shell.test.ts
@@ -0,0 +1,40 @@
+import fs from 'fs';
+import path from 'path';
+
+// TASK-730 (D223): the artboard's 390 frame is a 52px top bar over a single
+// column. jsdom has no layout engine, so this pins the presence of the rules
+// that carry it, the same way v2-layout-invariants.test.ts does.
+
+const css = fs.readFileSync(path.join(__dirname, '../v2.css'), 'utf8');
+// The block is the tail of the sheet, from its marker comment to the end.
+const phone = css.slice(css.indexOf('D223 (TASK-730 shell)'));
+
+describe('D223 phone shell', () => {
+  test('feature pages get a 52px top bar with the display title', () => {
+    expect(phone).toMatch(/\.v2-feature__header\s*\{[^}]*min-height:\s*52px/);
+    expect(phone).toMatch(/\.v2-feature__header\s+\.v2-feature__title\s*\{[^}]*font:\s*800 21px\/1 var\(--v2-font-display\)/);
+  });
+
+  test('the title clips to one line, and the whole block stays inside the 760px query', () => {
+    const title = phone.match(/\.v2-feature__header\s+\.v2-feature__title\s*\{([^}]*)\}/);
+    expect(title).not.toBeNull();
+    expect(title![1]).toContain('white-space: nowrap');
+    expect(title![1]).toContain('overflow: hidden');
+    expect(title![1]).toContain('text-overflow: ellipsis');
+    const mediaAt = phone.indexOf('@media (max-width: 760px)');
+    expect(mediaAt).toBeGreaterThan(-1);
+    expect(phone.indexOf('.v2-feature__header {')).toBeGreaterThan(mediaAt);
+    expect(phone.indexOf('.v2-feature__header .v2-feature__title')).toBeGreaterThan(mediaAt);
+  });
+
+  test('the page body is one tight column and settings leads with the same bar', () => {
+    expect(phone).toMatch(/\.v2-feature__body\s*\{[^}]*padding:\s*12px 12px 16px/);
+    expect(phone).toMatch(/\.v2-settings__title\s*\{[^}]*min-height:\s*52px/);
+  });
+
+  test('the block comes last in the sheet, so it outranks the earlier phone rules', () => {
+    const at = css.indexOf('D223 (TASK-730 shell)');
+    expect(at).toBeGreaterThan(css.indexOf('.v2-settings__title {'));
+    expect(css.indexOf('.v2-feature__body {')).toBeLessThan(at);
+  });
+});
diff --git a/frontend/src/v2/v2.css b/frontend/src/v2/v2.css
index 0cb32c445..0e0c63db6 100644
--- a/frontend/src/v2/v2.css
+++ b/frontend/src/v2/v2.css
@@ -10891,6 +10891,7 @@ details[open] > .v2-settings__summary > .v2-settings__icon:last-child { transfor
 .v2-root:lang(zh) .v2-inspector__detail-name,
 .v2-root:lang(zh) .v2-login__title,
 .v2-root:lang(zh) .v2-feature__title,
+.v2-root:lang(zh) .v2-feature__header .v2-feature__title,
 .v2-root:lang(zh) .v2-settings__title,
 .v2-root:lang(zh) .v2-settings__label,
 .v2-root:lang(zh) .v2-settings__account-name,
@@ -14060,3 +14061,38 @@ details[open] > .v2-settings__summary > .v2-settings__icon:last-child { transfor
 .v2-root button.v2-board__card-main:focus-visible, .v2-root button.v2-board__card-move:focus-visible {
   outline: 2px solid var(--v2-accent); outline-offset: 2px; box-shadow: none;
 }
+
+/* D223 (TASK-730 shell): the artboard's 390 frame is a 52px top bar over one
+   column. Feature pages (connectors, team, settings) share V2PageHead and the
+   V2FeaturePage body, so the bar and the tighter body live here once instead
+   of in each page. The tab bar's height is already reserved on .v2-feature. */
+@media (max-width: 760px) {
+  .v2-feature__header {
+    display: flex;
+    align-items: center;
+    min-height: 52px;
+    padding: 0 10px 0 12px;
+    gap: 8px;
+  }
+  .v2-feature__header .v2-page-head__identity { align-items: center; gap: 8px; }
+  .v2-feature__header .v2-feature__title {
+    font: 800 21px/1 var(--v2-font-display);
+    letter-spacing: -0.03em;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+  .v2-feature__header .v2-page-head__meta { min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+  .v2-feature__body { padding: 12px 12px 16px; }
+  .v2-settings__layout { padding-top: 0; }
+  .v2-settings__title {
+    display: flex;
+    align-items: center;
+    min-height: 52px;
+    margin: -12px -12px 12px;
+    padding: 0 12px;
+    border-bottom: 1px solid var(--v2-border-soft);
+    font: 800 21px/1 var(--v2-font-display);
+    letter-spacing: -0.03em;
+  }
+}