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>

drizzle/migrations/0006_nosy_black_queen.sql

@@ -0,0 +1,2 @@
+ALTER TABLE "tickets" ADD COLUMN "team_id" uuid;--> statement-breakpoint
+ALTER TABLE "tickets" ADD CONSTRAINT "tickets_team_id_teams_id_fk" FOREIGN KEY ("team_id") REFERENCES "public"."teams"("id") ON DELETE set null ON UPDATE no action;

drizzle/migrations/meta/_journal.json

@@ -43,6 +43,13 @@
       "when": 1781004398567,
       "tag": "0005_spotty_leader",
       "breakpoints": true
+    },
+    {
+      "idx": 6,
+      "version": "7",
+      "when": 1781008559188,
+      "tag": "0006_nosy_black_queen",
+      "breakpoints": true
     }
   ]
 }