feat: grouping phase 1 — schema, ungrouped tab, time-window grouping, hash verification

Schema:
- Add GroupingSource enum (ALBUM, MANUAL, AUTO_TIME, AUTO_PATTERN, etc.)
- Add groupingSource field to PackageGroup with backfill
- Add SystemNotification model for persistent alerts
- Add NotificationType and NotificationSeverity enums

Ungrouped staging tab:
- Add listUngroupedPackages/countUngroupedPackages queries
- Add "Ungrouped" tab to STL page showing packages without a group

Time-window auto-grouping:
- After album grouping, cluster ungrouped packages within configurable
  time window (default 5 min, AUTO_GROUP_TIME_WINDOW_MINUTES env var)
- Groups named from common filename prefix
- Groups created with groupingSource=AUTO_TIME

Hash verification after split:
- Re-hash split parts and compare to original contentHash
- Log error and create SystemNotification on mismatch
- Prevents silently corrupted split uploads

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/app/(app)/stls/_components/stl-table.tsx

@@ -38,7 +38,7 @@ import {
 } from "@/components/ui/dialog";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { Badge } from "@/components/ui/badge";
-import type { DisplayItem, IngestionAccountStatus } from "@/lib/telegram/types";
+import type { DisplayItem, IngestionAccountStatus, PackageListItem } from "@/lib/telegram/types";
 import type { SkippedRow } from "./skipped-columns";
 import {
   updatePackageCreator,
@@ -61,6 +61,9 @@ interface StlTableProps {
   skippedData: SkippedRow[];
   skippedPageCount: number;
   skippedTotalCount: number;
+  ungroupedData: PackageListItem[];
+  ungroupedPageCount: number;
+  ungroupedTotalCount: number;
 }
 
 export function StlTable({
@@ -73,6 +76,9 @@ export function StlTable({
   skippedData,
   skippedPageCount,
   skippedTotalCount,
+  ungroupedData,
+  ungroupedPageCount,
+  ungroupedTotalCount,
 }: StlTableProps) {
   const router = useRouter();
   const pathname = usePathname();
@@ -379,6 +385,23 @@ export function StlTable({
 
   const { table } = useDataTable({ data: tableRows, columns, pageCount });
 
+  const ungroupedRows: StlTableRow[] = useMemo(
+    () =>
+      ungroupedData.map((pkg) => ({
+        ...pkg,
+        _rowType: "package" as const,
+        _groupId: null,
+        _isGroupMember: false,
+      })),
+    [ungroupedData]
+  );
+
+  const { table: ungroupedTable } = useDataTable({
+    data: ungroupedRows,
+    columns,
+    pageCount: ungroupedPageCount,
+  });
+
   const activeTag = searchParams.get("tag") ?? "";
 
   return (
@@ -401,6 +424,14 @@ export function StlTable({
               </Badge>
             )}
           </TabsTrigger>
+          <TabsTrigger value="ungrouped" className="gap-1.5">
+            Ungrouped
+            {ungroupedTotalCount > 0 && (
+              <Badge variant="secondary" className="h-5 px-1.5 text-[10px]">
+                {ungroupedTotalCount}
+              </Badge>
+            )}
+          </TabsTrigger>
         </TabsList>
 
         <TabsContent value="packages" className="space-y-4">
@@ -472,6 +503,11 @@ export function StlTable({
             totalCount={skippedTotalCount}
           />
         </TabsContent>
+
+        <TabsContent value="ungrouped" className="space-y-4">
+          <DataTable table={ungroupedTable} emptyMessage="All packages are grouped!" />
+          <DataTablePagination table={ungroupedTable} totalCount={ungroupedTotalCount} />
+        </TabsContent>
       </Tabs>
 
       <PackageFilesDrawer