feat: share links visible on plants/containers; container image gallery

- Fix ShareButton silently swallowing errors from createShareLink; now
  shows inline error text so failures are visible to the user
- Add getShareLinksForEntity server action and EntityShareLink type to
  _core/share.ts
- Add ShareLinkList component — renders active share links per entity
  with per-row Revoke; renders nothing when empty
- Wire ShareLinkList into plant and container detail pages (loaded
  server-side in parallel with the entity fetch)
- Add images jsonb column to garden_containers schema + migration 0018
- Add addContainerImage / removeContainerImage / setContainerPrimaryImage
  server actions mirroring the plant image pattern (10-image cap, first
  upload auto-sets cover)
- Update ContainerDetailDto, listContainers, getContainer to include images
- Rewrite ContainerDetail with Info/Gallery tabs; Gallery tab mirrors
  plant gallery (3-col grid, star/X overlays, upload button, counter)
- Update ContainerShareData and container renderSharedView to show cover
  image hero and secondary image grid on public share pages

src/components/share-button.tsx

@@ -19,15 +19,21 @@ export function ShareButton({
   const [open, setOpen] = useState(false);
   const [shareUrl, setShareUrl] = useState<string | null>(null);
   const [copied, setCopied] = useState(false);
+  const [error, setError] = useState<string | null>(null);
   const [isPending, startTransition] = useTransition();
 
   function share() {
+    setError(null);
     startTransition(async () => {
-      const result = await createShareLink(entityType, entityId, {
-        capabilities: { read: true, write: canWrite },
-      });
-      setShareUrl(result.url);
-      setOpen(true);
+      try {
+        const result = await createShareLink(entityType, entityId, {
+          capabilities: { read: true, write: canWrite },
+        });
+        setShareUrl(result.url);
+        setOpen(true);
+      } catch (err) {
+        setError(err instanceof Error ? err.message : "Failed to create share link");
+      }
     });
   }
 
@@ -41,10 +47,13 @@ export function ShareButton({
 
   return (
     <>
-      <Button variant="outline" onClick={share} disabled={isPending}>
-        <Link />
-        Share
-      </Button>
+      <div className="flex flex-col items-end gap-1">
+        <Button variant="outline" onClick={share} disabled={isPending}>
+          <Link />
+          Share
+        </Button>
+        {error && <p className="text-xs text-red-500">{error}</p>}
+      </div>
 
       <Dialog open={open} onOpenChange={setOpen}>
         <DialogContent>

src/components/share-link-list.tsx

@@ -0,0 +1,53 @@
+"use client";
+
+import { useTransition } from "react";
+import { useRouter } from "next/navigation";
+import { revokeShareLink } from "@/modules/_core/share";
+import type { EntityShareLink } from "@/modules/_core/share";
+
+type Props = {
+  links: EntityShareLink[];
+};
+
+export function ShareLinkList({ links }: Props) {
+  const [isPending, startTransition] = useTransition();
+  const router = useRouter();
+
+  if (links.length === 0) return null;
+
+  function handleRevoke(id: string) {
+    startTransition(async () => {
+      await revokeShareLink(id);
+      router.refresh();
+    });
+  }
+
+  return (
+    <div className="flex flex-col gap-1 pt-1 border-t border-[var(--ink-faint)]">
+      <p className="text-xs font-semibold uppercase text-[var(--ink-mute)] tracking-wide">
+        Active share links ({links.length})
+      </p>
+      {links.map((link) => (
+        <div key={link.id} className="flex items-center justify-between gap-2 text-sm py-0.5">
+          <div className="flex flex-col">
+            <span className="text-[var(--ink-mute)]">
+              Created {new Date(link.createdAt).toLocaleDateString()}
+            </span>
+            {link.expiresAt && (
+              <span className="text-xs text-[var(--ink-mute)]">
+                Expires {new Date(link.expiresAt).toLocaleDateString()}
+              </span>
+            )}
+          </div>
+          <button
+            className="btn btn-ghost btn-sm text-red-500 hover:text-red-600"
+            onClick={() => handleRevoke(link.id)}
+            disabled={isPending}
+          >
+            Revoke
+          </button>
+        </div>
+      ))}
+    </div>
+  );
+}