fix(ux): pass-2 audit fixes — admin grouping, Duplicates entry, header tooltips

Three small but high-leverage fixes from the second audit pass on main:

Admin index (src/app/(dashboard)/[portSlug]/admin/page.tsx):
  - Grouped 21 sections into 7 categories: Access, Configuration, Content,
    Data Quality, Operations, Tenancy, Integrations. Each group has a
    one-line description so first-time admins can orient themselves
    without reading every card.
  - Added the missing Duplicates entry (links to /admin/duplicates from
    the dedup-migration work) under Data Quality.

More sheet (mobile bottom-drawer nav):
  - "Email" -> "Inbox". The page that opens is an email-inbox surface
    (Inbox + Accounts tabs), not a generic email composer. The previous
    label was ambiguous.

Interest detail header (Won / Lost outcome buttons):
  - Added title="Mark as won" / "Close as lost" so the icon-only buttons
    on mobile have a tooltip on long-press / desktop hover.
  - Tightened mobile padding (px-2 vs px-2.5) so the full-text desktop
    labels still fit on sm+ without re-introducing a regression where a
    visible mobile "Won"/"Lost" inline label crowded the right cluster
    enough to push Email/Call/WhatsApp action chips into a vertical
    stack.

Verification: 0 tsc errors, 926/926 vitest passing, lint clean.

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

src/components/interests/interest-detail-header.tsx

@@ -339,12 +339,19 @@ export function InterestDetailHeader({ portSlug, interest }: InterestDetailHeade
                 </button>
               ) : (
                 <>
+                  {/* Mobile: icon-only with title tooltip + colored fill carries
+                      the won/lost meaning (green vs rose). Adding a "Won" /
+                      "Lost" text label inline blew out the cluster width and
+                      forced the Email/Call/WhatsApp action-chip row above to
+                      stack vertically — bad trade. From sm up, the full
+                      "Mark won" / "Close as lost" labels read clearly. */}
                   <button
                     type="button"
                     onClick={() => setOutcomeDialog('won')}
                     aria-label="Mark as won"
+                    title="Mark as won"
                     className={cn(
-                      'inline-flex items-center gap-1.5 rounded-md px-2.5 py-1 text-xs font-medium transition-colors',
+                      'inline-flex items-center gap-1.5 rounded-md px-2 py-1 text-xs font-medium transition-colors sm:px-2.5',
                       'border border-emerald-200 bg-emerald-50 text-emerald-700',
                       'hover:bg-emerald-100',
                     )}
@@ -356,8 +363,9 @@ export function InterestDetailHeader({ portSlug, interest }: InterestDetailHeade
                     type="button"
                     onClick={() => setOutcomeDialog('lost')}
                     aria-label="Close as lost"
+                    title="Close as lost"
                     className={cn(
-                      'inline-flex items-center gap-1.5 rounded-md px-2.5 py-1 text-xs font-medium transition-colors',
+                      'inline-flex items-center gap-1.5 rounded-md px-2 py-1 text-xs font-medium transition-colors sm:px-2.5',
                       'border border-rose-200 text-rose-700',
                       'hover:bg-rose-50',
                     )}