feat: Customize hub + roles editor, terminal logo, invite links

IA refactor and the custom-roles editor pass 11 left as data-only.

Customize hub:
- New /customize (admin/board) with a left section rail: Roles,
  Membership tiers, Areas, Invite codes, Onboarding.
- One focused module per panel under app/(app)/customize/panels/
  plus a shared card and types file. The client shell is ~75 lines;
  each panel is self-contained (smart separation of concerns).
- Settings slimmed to Space, Integrations, Webhooks. Removed the
  Roles/Tiers/Invites/Onboarding tabs and the Areas block from
  settings-client.tsx (~700 lines) and the matching fetches from
  settings/page.tsx. Dead props/state/types removed.
- Sidebar: added a Customize NavLink (admin/board).

Roles editor:
- Rename/recolor the five built-in roles (upsertRoleLabel) and full
  CRUD on custom org roles. Adds the read path the audit flagged as
  missing: lib/role-labels.ts (getRoleLabelMap/roleDisplayName) is
  consumed in (app)/layout.tsx so the sidebar shows the renamed role.

Logo:
- Reverted the brand mark to the terminal >_ glyph
  (components/brand-mark.tsx) on the landing nav/footer, onboarding
  header, and favicon (public/logo.svg). Removed the dead local
  IcoTerminal. AtlasLogo stays only on the resources project page.

Invite links:
- InvitesPanel has Copy code and Copy link (/signup?invite=CODE).
  signup reads ?invite= on mount, prefills the code, preselects join.

Deferred and tracked in HANDOFF: types/database.ts sync, renamed-role
display on the members table, splitting the still-large
settings-client.tsx, custom-role assignment UI.

266/266 tests pass. Production build clean; /customize, /onboarding,
slimmed /settings all in the route table. No migration this pass.

app/(app)/customize/panels/card.tsx

@@ -0,0 +1,25 @@
+// Shared section card chrome for every Customize panel.
+export function Card({
+  title,
+  blurb,
+  action,
+  children,
+}: {
+  title: string
+  blurb: string
+  action?: React.ReactNode
+  children: React.ReactNode
+}) {
+  return (
+    <div className="bg-card border border-border rounded p-6">
+      <div className="flex items-start justify-between gap-3 mb-4">
+        <div>
+          <p className="font-mono text-[10px] tracking-widest text-muted-foreground uppercase">{title}</p>
+          <p className="font-sans text-sm text-muted-foreground mt-1">{blurb}</p>
+        </div>
+        {action}
+      </div>
+      {children}
+    </div>
+  )
+}