fix(admin): style the Teams admin screen with the site's own classes

The Teams admin screen was written against four CSS classes that do not
exist anywhere in the project — `.table`, `.kv`, `.list` and `.notice` —
and against `.btn-ghost` / `.btn` used without the `.btn` box they depend
on. The result rendered as unstyled UA tables and bare browser buttons
sitting flush against unpadded panels, and looked nothing like the rest
of the admin panel.

Nothing here changes behaviour, data or routes; it is presentation only.

- Tables become `adm-table` / `adm-th` / `adm-td` inside `panel-flat`,
  the markup the other fourteen admin views use, and scroll rather than
  clip when a row is wider than the shell (a status badge and the action
  buttons are both nowrap by design, so a narrow viewport can always
  overflow one).
- Buttons take the full `btn btn-primary btn-sq` / `btn btn-ghost btn-sq`
  triplet. `.btn` carries the padding, border and radius; the variants
  carry only colour, so a bare `.btn-ghost` had none of the box and a
  bare `.btn` fell back to the UA's light button face.
- `.panel` supplies no padding, so every panel now sets it explicitly at
  22px, as ModulesAdmin and EmptyState already do.
- Headings become `h2.display`, and the in-page `<h1>Teams</h1>` goes
  away in favour of AdminLayout's topbar title — which needed
  `/admin/teams` adding to TITLES, the reason the bar read "ADMIN".
- Status pills use the existing `badge-pub` / `badge-moderator` /
  `badge-ban` / `badge-draft` modifiers. `.badge` alone declares no
  border, so the old inline `borderColor` was inert.
- The bridge and voice panels drop their private palette
  (`#e08b77` / `#8fbf7a` / `#e0b877`) for the site's
  `#d98b84` / `#7fd0a4` / `#e0b070`, and a literal `rgba(255,255,255,.12)`
  rule and a `borderRadius: 4` for `var(--line-soft)` and
  `var(--radius-input)`.

Walked live against the dev DB as an admin: sync panel, review queue, all
Teams, the forum ledger, the bridge draft form and its acknowledgement
dialog. Client 288/288, server 1162/1162, client build clean.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WnDSWzpUjw8t8C2hghysNz

client/src/routes/admin/AdminLayout.jsx

@@ -146,6 +146,7 @@ const TITLES = {
   '/admin/moderation': 'Moderation',
   '/admin/moderation/appeals': 'Appeals',
   '/admin/moderation/reports': 'Reports',
+  '/admin/teams': 'Teams',
   '/admin/settings': 'Site Settings',
   '/admin/appearance': 'Appearance',
   '/admin/navigation': 'Navigation',