feat: fix channel scanning bugs, add package tags, and kickstarters tab

Bug fixes:
- Fix channels not being scanned by paginating TDLib getChats (was only
  loading first batch, additional channels were unknown to TDLib)
- Add per-channel getChat pre-load as safety net before scanning
- Fix preview pictures not loading by checking previewData instead of
  previewMsgId for hasPreview flag
- Prevent previewMsgId from being set when preview download fails

Package Tags:
- Add tags Text[] column to Package with migration backfilling from
  channel categories
- Worker auto-inherits source channel category as initial tag
- Tag filter dropdown and Tags column in STL Files table
- Server actions for individual and bulk tag editing

Kickstarters Tab:
- New KickstarterHost, Kickstarter, and KickstarterPackage models
- Full CRUD with delivery status, payment status, host management
- Package linking (many-to-many with existing packages)
- Sidebar entry with Gift icon
- Table with search, filters, modal forms

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

src/app/(app)/kickstarters/_components/kickstarter-modal.tsx

@@ -0,0 +1,54 @@
+"use client";
+
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { KickstarterForm } from "./kickstarter-form";
+
+interface HostOption {
+  id: string;
+  name: string;
+  _count: { kickstarters: number };
+}
+
+interface KickstarterModalProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  hosts: HostOption[];
+  kickstarter?: {
+    id: string;
+    name: string;
+    link: string | null;
+    filesUrl: string | null;
+    deliveryStatus: "NOT_DELIVERED" | "PARTIAL" | "DELIVERED";
+    paymentStatus: "PAID" | "UNPAID";
+    hostId: string | null;
+    notes: string | null;
+  };
+}
+
+export function KickstarterModal({ open, onOpenChange, hosts, kickstarter }: KickstarterModalProps) {
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="sm:max-w-lg">
+        <DialogHeader>
+          <DialogTitle>{kickstarter ? "Edit Kickstarter" : "Add Kickstarter"}</DialogTitle>
+          <DialogDescription>
+            {kickstarter
+              ? "Update the kickstarter details below."
+              : "Track a new Kickstarter or crowdfunding campaign."}
+          </DialogDescription>
+        </DialogHeader>
+        <KickstarterForm
+          kickstarter={kickstarter}
+          hosts={hosts}
+          onSuccess={() => onOpenChange(false)}
+        />
+      </DialogContent>
+    </Dialog>
+  );
+}