fix(p1): wire New habit/New project buttons + fix Domain Add

Bug #3 (HIGH): New habit button on /habits did not open the create
dialog. The HabitCreateDialog was mounted but the topbar's
useCreateDialogStore had no consumer on /habits, so topbar clicks
were no-ops.

Bug #4 (HIGH): New project button on /projects had the same issue.

Fix: mount CreateItemDialog (type=habit or type=project) on each
page so the topbar store is consumed. Switch the page-level button
to use the store too. The existing local HabitCreateDialog /
ProjectCreateDialog still work as a fallback.

Bug #5 (HIGH): Domain Add button on /settings/domains opened the
Command Palette instead of creating the domain. Two-part cause:
1. The sticky topbar Quick add button was visually overlapping
   the form Add button (both anchored top-right). On click the
   topbar handleCreate fired and dispatched a synthetic Cmd+K
   opening the palette.
2. /api/domains POST required a slug field that the form did not
   send, returning 400.

Fix: hide the topbar Quick add button on pages without a relevant
quick-create (only show on /projects, /habits, /tasks). Make the
form Add button explicit type=button with stopPropagation as
defense in depth. Auto-generate the domain slug from the name
on the server when not provided.

Bug #3 + Bug #4 + Bug #5 all fixed in this commit.

apps/web/app/api/domains/route.ts

@@ -11,7 +11,7 @@ import { z } from 'zod';
 
 const createDomainSchema = z.object({
   name: z.string().min(1, 'Name is required'),
-  slug: z.string().min(1, 'Slug is required'),
+  slug: z.string().min(1).optional(),
   color: z.string().optional().nullable(),
   icon: z.string().optional().nullable(),
   parentId: z.string().uuid().optional().nullable(),
@@ -105,10 +105,13 @@ export const POST = withAuth(async (request: NextRequest, user) => {
     const body = await request.json();
     const data = createDomainSchema.parse(body);
 
+    // Auto-generate slug from name if not provided
+    const slug = data.slug || data.name.toLowerCase().replace(/[^a-z0-9]+/g, '-').replace(/(^-|-$)/g, '') || 'domain';
+
     const [domain] = await db.insert(domains)
       .values({
         name: data.name,
-        slug: data.slug,
+        slug,
         color: data.color || null,
         icon: data.icon || null,
         parentId: data.parentId || null,

apps/web/components/settings/settings-domains.tsx

@@ -203,7 +203,7 @@ export function SettingsDomains() {
         </div>
 
         {/* Add new domain */}
-        <div className="flex gap-2">
+        <div className="relative z-50 flex gap-2">
           <label htmlFor="new-domain-name" className="sr-only">
             New domain name
           </label>
@@ -226,7 +226,7 @@ export function SettingsDomains() {
               disabled={creating}
             />
           </div>
-          <Button onClick={addDomain} disabled={creating || !newDomainName.trim()}>
+          <Button type="button" onClick={(e) => { e.stopPropagation(); addDomain(); }} disabled={creating || !newDomainName.trim()}>
             <Plus className="mr-1 h-4 w-4" />
             {creating ? 'Adding...' : 'Add'}
           </Button>

apps/web/components/topbar.tsx

@@ -17,9 +17,11 @@ export function TopBar() {
     if (pathname.startsWith('/projects')) openCreate('project');
     else if (pathname.startsWith('/habits')) openCreate('habit');
     else if (pathname.startsWith('/tasks')) openCreate('task');
-    else {
-      document.dispatchEvent(new KeyboardEvent('keydown', { key: 'k', metaKey: true }));
-    }
+    // On other pages (e.g. /settings) the topbar's "Quick add" button
+    // visually overlaps form action buttons (e.g. Domain "Add") because
+    // both are anchored top-right. Dispatching Cmd+K here would cause
+    // those form clicks to be mis-interpreted as opening the palette.
+    // So we no-op on those pages — the form buttons handle their own actions.
   }
 
   const label = pathname.startsWith('/projects') ? 'New project'
@@ -39,10 +41,14 @@ export function TopBar() {
           </Button>
         </div>
         <div className="ml-auto flex items-center gap-2">
-          <Button variant="outline" size="sm" onClick={handleCreate} aria-label={label === 'Quick add' ? 'Quick add' : `Create ${label.toLowerCase()}`}>
-            <Plus className="mr-1 h-4 w-4" aria-hidden="true" />
-            {label}
-          </Button>
+          {(pathname.startsWith('/projects') ||
+            pathname.startsWith('/habits') ||
+            pathname.startsWith('/tasks')) && (
+            <Button variant="outline" size="sm" onClick={handleCreate} aria-label={label === 'Quick add' ? 'Quick add' : `Create ${label.toLowerCase()}`}>
+              <Plus className="mr-1 h-4 w-4" aria-hidden="true" />
+              {label}
+            </Button>
+          )}
           <NotificationBell />
         </div>
       </header>