feat: team assignment on tickets + My team's tickets view

Backend:
- team_id column on tickets table
- team_id filter in GET /tickets (resolves team members)
- team_id in UpdateTicketSchema + PATCH handler
- SetTeam transaction type

Frontend:
- Team selector in ticket detail properties sidebar
- My team's tickets in sidebar (when user belongs to a team)
- team_id passed through to API from ticket list page

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/components/app-shell.tsx

@@ -8,6 +8,7 @@ import {
   LayoutGridIcon,
   PlusIcon,
   UserIcon,
+  UsersIcon,
   InboxIcon,
   ClockIcon,
   SettingsIcon,
@@ -91,6 +92,7 @@ function SidebarNav() {
   const [savedViews, setSavedViews] = useState<SavedView[]>([]);
   const [dashboards, setDashboards] = useState<Dashboard[]>([]);
   const [currentUserId, setCurrentUserId] = useState<string | null>(null);
+  const [myTeamId, setMyTeamId] = useState<string | null>(null);
   const [expanded, setExpanded] = useState<Record<string, boolean>>({
     dashboards: true,
     queues: true,
@@ -145,6 +147,7 @@ function SidebarNav() {
       const userTeams = allTeams.filter((t) =>
         (t.members ?? []).some((m) => m.id === myId)
       );
+      setMyTeamId(userTeams[0]?.id ?? null);
       const teamIds = new Set(userTeams.map((t) => t.id));
       const visible = allDashboards.filter((d) =>
         !d.team_id || teamIds.has(d.team_id)
@@ -171,6 +174,13 @@ function SidebarNav() {
       count: counts.my,
       icon: UserIcon,
     },
+    ...(myTeamId ? [{
+      label: "My team's tickets",
+      href: `/?view=team&team_id=${myTeamId}`,
+      param: "team",
+      count: undefined as number | undefined,
+      icon: UsersIcon,
+    }] : []),
     {
       label: "Unassigned",
       href: "/?view=unassigned",