feat: batch ticket operations — multi-select, bulk status, bulk assign

- Checkbox column on every ticket row
- Select multiple tickets via checkboxes
- Floating sticky action bar at bottom when tickets selected:
  - Shows count: "3 selected" with Clear button
  - Quick status change buttons
  - Assign to me button
- Checkbox click stops propagation (doesn't select ticket for triage panel)
- Batch operations run sequentially via API

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

web/src/app/page.tsx

@@ -185,6 +185,8 @@ function TicketWorkbenchContent() {
   const [error, setError] = useState<string | null>(null);
   const [selectedId, setSelectedId] = useState<number | null>(null);
   const [selectedTxs, setSelectedTxs] = useState<Transaction[]>([]);
+  const [batchIds, setBatchIds] = useState<Set<number>>(new Set());
+  const [batchSaving, setBatchSaving] = useState(false);
 
   const [searchQuery, setSearchQuery] = useState("");
   const [filters, setFilters] = useState<Filter[]>([]);
@@ -543,6 +545,36 @@ function TicketWorkbenchContent() {
       setTickets((prev) => prev.map((t) => (t.id === ticketId ? data.ticket : t)));
     }
   };
+
+  const handleBatchStatus = async (newStatus: string) => {
+    setBatchSaving(true);
+    for (const id of batchIds) {
+      await updateTicket(id, { status: newStatus });
+    }
+    setBatchSaving(false);
+    setBatchIds(new Set());
+    await fetchData();
+  };
+
+  const handleBatchAssign = async () => {
+    const me = users[0]?.id;
+    if (!me) return;
+    setBatchSaving(true);
+    for (const id of batchIds) {
+      await updateTicket(id, { owner_id: me });
+    }
+    setBatchSaving(false);
+    setBatchIds(new Set());
+    await fetchData();
+  };
+
+  const toggleBatchId = (id: number) => {
+    setBatchIds((prev) => {
+      const next = new Set(prev);
+      if (next.has(id)) next.delete(id); else next.add(id);
+      return next;
+    });
+  };
   const handleColumnResize = (colKey: string, e: React.MouseEvent) => {
     e.preventDefault();
     e.stopPropagation();
@@ -931,8 +963,17 @@ function TicketWorkbenchContent() {
                           ? "bg-accent/80 shadow-[inset_3px_0_0_var(--primary)]"
                           : "hover:bg-accent/45"
                       )}
-                      style={{ width: availableColumns.filter((c) => c.visible).reduce((sum, c) => sum + c.width, 96), minWidth: "100%" }}
+                      style={{ width: availableColumns.filter((c) => c.visible).reduce((sum, c) => sum + c.width, 96) + 36, minWidth: "100%" }}
                     >
+                      {/* Checkbox */}
+                      <span className="flex w-9 shrink-0 items-center justify-center" onClick={(e) => e.stopPropagation()}>
+                        <input
+                          type="checkbox"
+                          checked={batchIds.has(ticket.id)}
+                          onChange={() => toggleBatchId(ticket.id)}
+                          className="h-3.5 w-3.5 rounded border-border accent-primary"
+                        />
+                      </span>
                       {availableColumns.filter((c) => c.visible).map((col) => {
                         if (col.key.startsWith("cf.")) {
                           const cfKey = col.key.slice(3);
@@ -1010,6 +1051,41 @@ function TicketWorkbenchContent() {
           </div>
         </section>
 
+        {/* Floating batch action bar */}
+        {batchIds.size > 0 && (
+          <div className="sticky bottom-0 z-20 flex items-center gap-3 border-t border-border bg-card/95 px-5 py-3 shadow-lg backdrop-blur">
+            <span className="text-sm font-semibold tabular-nums text-foreground">
+              {batchIds.size} selected
+            </span>
+            <button type="button" onClick={() => setBatchIds(new Set())} className="text-xs text-muted-foreground hover:text-foreground">
+              Clear
+            </button>
+            <div className="ml-auto flex items-center gap-2">
+              <span className="text-xs text-muted-foreground">Status:</span>
+              {statusOptions.filter((s) => s.key !== "all").slice(0, 5).map((s) => (
+                <button
+                  key={s.key}
+                  type="button"
+                  disabled={batchSaving}
+                  onClick={() => handleBatchStatus(s.key)}
+                  className="rounded bg-muted/60 px-2.5 py-1 text-xs font-semibold text-foreground hover:bg-accent disabled:opacity-50"
+                >
+                  {s.label}
+                </button>
+              ))}
+              <div className="mx-2 h-5 w-px bg-border" />
+              <button
+                type="button"
+                disabled={batchSaving}
+                onClick={handleBatchAssign}
+                className="rounded bg-primary px-3 py-1 text-xs font-semibold text-primary-foreground hover:bg-primary/90 disabled:opacity-50"
+              >
+                {batchSaving ? "Saving..." : "Assign to me"}
+              </button>
+            </div>
+          </div>
+        )}
+
         <aside className="hidden min-h-0 border-l border-border bg-card/76 backdrop-blur xl:flex xl:flex-col">
           {selectedTicket ? (
             <>