feat: add project settings page with tabbed layout

- Create SettingsTabLayout component with sidebar navigation
- Create ProjectSettingsPage with General settings tab
- Create RepositoriesSettingsTab for repo management
- Add Members placeholder tab
- Update router with settings routes
- Add CSS styles for settings layout
- Navigate to /projects/:id/settings from workspace header

apps/web/src/styles.css

@@ -707,11 +707,62 @@ a {
   display: flex;
   justify-content: space-between;
   align-items: center;
-  padding: 1rem;
+  padding: 1rem 1.5rem;
   border-bottom: 1px solid var(--border);
   background: var(--panel);
 }
 
+.workspace-header-left {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+}
+
+.workspace-header-icon {
+  font-size: 1.5rem;
+}
+
+.workspace-header-info {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.workspace-header-title {
+  margin: 0;
+  font-size: 1.25rem;
+  font-weight: 600;
+}
+
+.workspace-header-subtitle {
+  color: var(--muted);
+  font-size: 0.875rem;
+}
+
+.workspace-header-actions {
+  display: flex;
+  gap: 0.5rem;
+}
+
+.workspace-header-action-btn {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.5rem 1rem;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  background: var(--panel);
+  color: var(--ink);
+  font-size: 0.875rem;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.workspace-header-action-btn:hover {
+  background: var(--bg);
+  border-color: var(--brand);
+}
+
 .workspace-title {
   display: flex;
   align-items: center;
@@ -1034,3 +1085,121 @@ a {
   background: rgba(16, 185, 129, 0.1);
   border-radius: 4px;
 }
+
+/* Settings Layout */
+.settings-layout {
+  display: flex;
+  gap: 2rem;
+  padding: 1.5rem 0;
+}
+
+.settings-sidebar {
+  width: 200px;
+  flex-shrink: 0;
+}
+
+.settings-nav {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.settings-nav-link {
+  padding: 0.625rem 1rem;
+  border-radius: 8px;
+  color: var(--muted);
+  text-decoration: none;
+  font-size: 0.95rem;
+  transition: all 0.2s;
+}
+
+.settings-nav-link:hover {
+  background: var(--bg);
+  color: var(--ink);
+}
+
+.settings-nav-link.active {
+  background: var(--brand);
+  color: white;
+  font-weight: 500;
+}
+
+.settings-content {
+  flex: 1;
+  min-width: 0;
+}
+
+.settings-panel {
+  background: var(--panel);
+  border: 1px solid var(--border);
+  border-radius: 14px;
+  padding: 1.5rem;
+}
+
+.settings-panel h2 {
+  margin: 0 0 1.25rem;
+  font-size: 1.25rem;
+}
+
+.settings-breadcrumb {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-size: 0.9rem;
+  color: var(--muted);
+  margin-bottom: 1rem;
+}
+
+.settings-breadcrumb a {
+  color: var(--brand);
+  text-decoration: none;
+}
+
+.settings-breadcrumb a:hover {
+  text-decoration: underline;
+}
+
+.project-settings-page {
+  padding: 1.5rem;
+}
+
+/* Repositories Settings Tab */
+.repositories-settings-tab h2 {
+  margin: 0 0 1.25rem;
+  font-size: 1.25rem;
+}
+
+.repositories-list {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+}
+
+.repository-card {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 1rem;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 10px;
+}
+
+.repository-info h3 {
+  margin: 0 0 0.25rem;
+  font-size: 1rem;
+}
+
+.repository-info p {
+  margin: 0 0 0.5rem;
+  font-size: 0.85rem;
+  color: var(--muted);
+}
+
+.repo-type {
+  font-size: 0.75rem;
+  padding: 0.2rem 0.5rem;
+  background: var(--brand);
+  color: white;
+  border-radius: 999px;
+}