In-app notification inbox, consolidate /profile into /me, theme realign

In-app notification center (Phase 5, migration 051):
- notifications.read_at + partial unread index. /me Notifications is now
  an inbox: unread styling, click to expand the message + mark read,
  "mark all as read", unread count. markNotificationsRead is a service-
  client write scoped to the caller's own member_id. Always-on channel:
  email-muted ('skipped') notifications still appear in-app.

Consolidate /profile into /me:
- Delete app/(app)/profile/*; /me is the single member page. Port the
  conflict-of-interest privileged-role nudge + last-disclosed date into
  /me's profile editor. Remove the "My profile" sidebar + command-palette
  entries; rename the /me nav label to "My membership". Repoint the
  recruitment empty-state link to /me.

Theme realign:
- Revert the rounded-lg cards introduced in the prior /me visual pass to
  rounded (the app norm, matching the former /profile). Route /me section
  headers through the SectionTitle primitive.

Regression guard:
- integration/auth-embed.test.ts runs the auth layout's
  space_members.select('*, spaces(*)') embed through PostgREST and fails
  on PGRST201, so a future junction table cannot silently break auth again.

components/app-sidebar.tsx

@@ -13,7 +13,7 @@ type Space = Tables<'spaces'>
 import {
   Menu, X, LayoutDashboard, ListChecks, FolderKanban, Settings2, Wrench,
   MessageSquare, Users, CreditCard, BookUser, Download, LogOut,
-  Vote, ShieldAlert, ScrollText, LineChart, UserCircle, UserSearch,
+  Vote, ShieldAlert, ScrollText, LineChart, UserSearch,
   MessagesSquare, SlidersHorizontal, ClipboardList, FileText, Award, BadgeCheck, GraduationCap, Hammer,
   ChevronDown, DoorClosed, CalendarCheck,
 } from 'lucide-react'
@@ -219,8 +219,7 @@ export function AppSidebar({ member, roleName, taskBadge = 0, commsBadge = 0, pa
         </NavSection>
 
         <NavSection id="account" title="Account">
-          <NavLink href="/profile" label="My profile" icon={UserCircle} active={isActive('/profile')} onClick={onNav} />
-          <NavLink href="/me" label="My access" icon={BadgeCheck} active={isActive('/me')} onClick={onNav} />
+          <NavLink href="/me" label="My membership" icon={BadgeCheck} active={isActive('/me')} onClick={onNav} />
         </NavSection>
 
         {showAdminSection && (