feat: complete responsive spacing improvements

- Add page-specific responsive styles for all pages
- Mobile form full-width inputs
- Stack project/repository cards on mobile
- Git toolbar wrapping on mobile
- Dashboard grid single column on mobile
- Settings layout stacking on mobile
- Touch target verification (min 44px)
- Table horizontal scroll wrapper
- SSH key list responsive layout
- Text overflow prevention in cards

Quality gates: typecheck ✓, lint ✓, build ✓

apps/web/src/styles.css

@@ -2089,3 +2089,131 @@ button,
     max-width: 1200px;
   }
 }
+
+/* ============================================
+   Page-Specific Responsive Styles
+   ============================================ */
+
+/* Forms - Full width on mobile */
+@media (max-width: 767px) {
+  .form-field input,
+  .form-field textarea,
+  .form-field select {
+    width: 100%;
+    min-height: 44px;
+  }
+
+  /* Settings page stack */
+  .settings-layout {
+    flex-direction: column;
+  }
+
+  .settings-nav {
+    flex-direction: row;
+    overflow-x: auto;
+    padding-bottom: var(--space-2);
+  }
+
+  /* Project cards full width */
+  .project-card {
+    flex-direction: column;
+    gap: var(--space-3);
+  }
+
+  .project-actions {
+    width: 100%;
+    justify-content: flex-start;
+  }
+
+  /* Repository cards */
+  .repository-card {
+    flex-direction: column;
+    gap: var(--space-3);
+    align-items: flex-start;
+  }
+
+  .repository-actions {
+    width: 100%;
+    justify-content: flex-start;
+  }
+
+  /* Git toolbar wrap */
+  .git-toolbar {
+    flex-wrap: wrap;
+    gap: var(--space-2);
+  }
+
+  /* Dashboard cards */
+  .dashboard-grid {
+    grid-template-columns: 1fr;
+  }
+
+  /* Stack form actions */
+  .form-actions {
+    flex-direction: column;
+    width: 100%;
+  }
+
+  .form-actions button {
+    width: 100%;
+    justify-content: center;
+  }
+}
+
+/* Ensure all pages have proper padding */
+.stack > h1,
+.stack > h2 {
+  margin-top: 0;
+}
+
+/* Touch target verification override */
+button,
+[role="button"],
+a.nav-item,
+.tree-entry {
+  min-height: 44px;
+}
+
+/* Table horizontal scroll wrapper */
+.table-wrapper {
+  overflow-x: auto;
+  -webkit-overflow-scrolling: touch;
+  width: 100%;
+}
+
+/* Dialog content spacing */
+.dialog-body {
+  padding: var(--space-4) 0;
+}
+
+/* Prevent text overflow in cards */
+.card h3,
+.card p {
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+/* SSH keys table responsive */
+.ssh-key-list {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-3);
+}
+
+.ssh-key-item {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-2);
+  padding: var(--space-4);
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 10px;
+}
+
+@media (min-width: 768px) {
+  .ssh-key-item {
+    flex-direction: row;
+    justify-content: space-between;
+    align-items: center;
+  }
+}