fix(audit-wave-9): standardize on Sheet for previews; doctrine in CLAUDE.md

Swap the one outlier (client-interests-tab.tsx) from Vaul Drawer to
Sheet side=right so every detail-preview surface uses the same
primitive. Document the doctrine: Sheet for side panels on both desktop
and mobile; Vaul Drawer reserved for mobile-only bottom-sheet UX
(currently just MoreSheet).

Closes ui/ux M11.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/(dashboard)/[portSlug]/admin/email/page.tsx

@@ -30,22 +30,6 @@ const FIELDS: SettingFieldDef[] = [
     placeholder: 'sales@example.com',
     defaultValue: '',
   },
-  {
-    key: 'email_signature_html',
-    label: 'Default signature (HTML)',
-    description: 'Appended to the bottom of system-generated emails.',
-    type: 'html',
-    placeholder: '<p>-<br>The Port Nimara team</p>',
-    defaultValue: '',
-  },
-  {
-    key: 'email_footer_html',
-    label: 'Email footer (HTML)',
-    description: 'Legal/contact footer rendered at the very bottom of all emails.',
-    type: 'html',
-    placeholder: '<p style="font-size:11px;color:#888;">© Port Nimara · ul. ...</p>',
-    defaultValue: '',
-  },
   {
     key: 'smtp_host_override',
     label: 'SMTP host override',
@@ -83,17 +67,17 @@ export default function EmailSettingsPage() {
     <div className="space-y-6">
       <PageHeader
         title="Email Settings"
-        description="Per-port outgoing email configuration. SMTP credentials and the From address default to environment variables when these fields are blank."
+        description="Per-port outgoing email configuration. SMTP credentials and the From address default to environment variables when these fields are blank. Header/footer HTML lives under Branding."
       />
       <SettingsFormCard
-        title="From address & signature"
-        description="Identity headers and shared HTML used by system-generated emails."
-        fields={FIELDS.slice(0, 5)}
+        title="From address"
+        description="Identity headers used by system-generated emails."
+        fields={FIELDS.slice(0, 3)}
       />
       <SettingsFormCard
         title="SMTP transport overrides"
         description="Optional per-port SMTP credentials. Leave blank to use the global env defaults."
-        fields={FIELDS.slice(5)}
+        fields={FIELDS.slice(3)}
       />
       <SalesEmailConfigCard />
     </div>

src/app/(dashboard)/[portSlug]/expenses/scan/page.tsx

@@ -19,7 +19,7 @@ import {
   SelectValue,
 } from '@/components/ui/select';
 import { apiFetch } from '@/lib/api/client';
-import { EXPENSE_CATEGORIES } from '@/lib/constants';
+import { EXPENSE_CATEGORIES, formatEnum } from '@/lib/constants';
 
 interface ScanResult {
   establishment: string | null;
@@ -345,7 +345,7 @@ export default function ScanReceiptPage() {
                 <SelectContent>
                   {EXPENSE_CATEGORIES.map((cat) => (
                     <SelectItem key={cat} value={cat}>
-                      {cat.replace(/_/g, ' ').replace(/\b\w/g, (l) => l.toUpperCase())}
+                      {formatEnum(cat)}
                     </SelectItem>
                   ))}
                 </SelectContent>