feat: group merge, ZIP/reply/caption grouping, integrity audit

Group merge UI:
- Add mergeGroups query and mergeGroupsAction server action
- Add "Start Merge" / "Merge Here" buttons to group row actions
- Two-step UX: click Start on source, click Merge Here on target

ZIP path prefix grouping (Signal 7):
- Compare PackageFile.path root folders across ungrouped packages
- Auto-group if 2+ packages share the same dominant root folder

Reply chain grouping (Signal 6):
- Capture reply_to_message_id during channel scanning
- Group archives that reply to the same root message
- Add replyToMessageId field to Package schema

Caption fuzzy match grouping (Signal 8):
- Capture source caption during channel scanning
- Normalize captions (strip extensions, extract significant words)
- Group packages with matching normalized caption keys
- Add sourceCaption field to Package schema

Periodic integrity audit:
- Check multipart packages for completeness (parts vs destMessageIds)
- Detect orphaned indexes (destChannelId set but no destMessageId)
- Runs after each ingestion cycle, deduplicates notifications

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

src/app/(app)/stls/_components/package-columns.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { type ColumnDef } from "@tanstack/react-table";
-import { FileArchive, Eye, ChevronRight, Layers, Ungroup, Send, ImagePlus } from "lucide-react";
+import { FileArchive, Eye, ChevronRight, Layers, Ungroup, Send, ImagePlus, GitMerge } from "lucide-react";
 import { DataTableColumnHeader } from "@/components/shared/data-table-column-header";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
@@ -69,6 +69,9 @@ interface PackageColumnsProps {
   onGroupPreviewUpload: (groupId: string) => void;
   selectedPackages: Set<string>;
   onToggleSelect: (packageId: string) => void;
+  mergeSourceId: string | null;
+  onStartMerge: (groupId: string) => void;
+  onCompleteMerge: (targetGroupId: string) => void;
 }
 
 export function formatBytes(bytesStr: string): string {
@@ -148,6 +151,9 @@ export function getPackageColumns({
   onGroupPreviewUpload,
   selectedPackages,
   onToggleSelect,
+  mergeSourceId,
+  onStartMerge,
+  onCompleteMerge,
 }: PackageColumnsProps): ColumnDef<StlTableRow, unknown>[] {
   return [
     {
@@ -392,6 +398,8 @@ export function getPackageColumns({
       cell: ({ row }) => {
         const data = row.original;
         if (isGroupRow(data)) {
+          const isMergeSource = mergeSourceId === data.id;
+          const canMergeHere = mergeSourceId !== null && mergeSourceId !== data.id;
           return (
             <div className="flex items-center gap-0.5">
               <Button
@@ -403,6 +411,26 @@ export function getPackageColumns({
               >
                 <Send className="h-4 w-4" />
               </Button>
+              <Button
+                variant="ghost"
+                size="icon"
+                className={`h-8 w-8 ${isMergeSource ? "text-amber-500 bg-amber-500/10 hover:bg-amber-500/20" : ""}`}
+                onClick={() => onStartMerge(data.id)}
+                title={isMergeSource ? "Cancel merge (this group is the merge source)" : "Start merge — mark this group as merge source"}
+              >
+                <GitMerge className="h-4 w-4" />
+              </Button>
+              {canMergeHere && (
+                <Button
+                  variant="ghost"
+                  size="icon"
+                  className="h-8 w-8 text-primary bg-primary/10 hover:bg-primary/20"
+                  onClick={() => onCompleteMerge(data.id)}
+                  title="Merge source group into this group"
+                >
+                  <Layers className="h-4 w-4" />
+                </Button>
+              )}
               <Button
                 variant="ghost"
                 size="icon"

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

@@ -49,6 +49,7 @@ import {
   removeFromGroupAction,
   sendAllInGroupAction,
   updateGroupPreviewAction,
+  mergeGroupsAction,
 } from "../actions";
 
 interface StlTableProps {
@@ -102,6 +103,9 @@ export function StlTable({
   const previewInputRef = useRef<HTMLInputElement>(null);
   const [uploadGroupId, setUploadGroupId] = useState<string | null>(null);
 
+  // Group merge state
+  const [mergeSourceId, setMergeSourceId] = useState<string | null>(null);
+
   const toggleGroup = useCallback((groupId: string) => {
     setExpandedGroups((prev) => {
       const next = new Set(prev);
@@ -340,6 +344,35 @@ export function StlTable({
     [uploadGroupId, router]
   );
 
+  const handleStartMerge = useCallback((groupId: string) => {
+    setMergeSourceId((prev) => {
+      if (prev === groupId) {
+        toast.info("Merge cancelled");
+        return null;
+      }
+      toast.info("Merge source selected — click the merge-here button on the target group");
+      return groupId;
+    });
+  }, []);
+
+  const handleMergeGroups = useCallback(
+    (targetGroupId: string) => {
+      if (!mergeSourceId) return;
+      const sourceId = mergeSourceId;
+      startTransition(async () => {
+        const result = await mergeGroupsAction(targetGroupId, sourceId);
+        if (result.success) {
+          toast.success("Groups merged successfully");
+          setMergeSourceId(null);
+          router.refresh();
+        } else {
+          toast.error(result.error);
+        }
+      });
+    },
+    [mergeSourceId, router]
+  );
+
   const columns = getPackageColumns({
     onViewFiles: (pkg) => setViewPkg(pkg),
     searchTerm,
@@ -381,6 +414,9 @@ export function StlTable({
     onGroupPreviewUpload: handleGroupPreviewUpload,
     selectedPackages,
     onToggleSelect: toggleSelect,
+    mergeSourceId,
+    onStartMerge: handleStartMerge,
+    onCompleteMerge: handleMergeGroups,
   });
 
   const { table } = useDataTable({ data: tableRows, columns, pageCount });