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/modules/_core/share.ts

@@ -100,6 +100,48 @@ export async function revokeShareLink(id: string): Promise<void> {
 
 export type ActiveShareLink = typeof shareLinks.$inferSelect;
 
+export type EntityShareLink = {
+  id: string;
+  createdAt: string;
+  expiresAt: string | null;
+  capabilities: ShareLinkCapabilities;
+};
+
+export async function getShareLinksForEntity(
+  entityType: string,
+  entityId: string,
+): Promise<EntityShareLink[]> {
+  const { household } = await getCurrentSession();
+  const now = new Date();
+
+  const rows = await db
+    .select({
+      id: shareLinks.id,
+      createdAt: shareLinks.createdAt,
+      expiresAt: shareLinks.expiresAt,
+      capabilities: shareLinks.capabilities,
+    })
+    .from(shareLinks)
+    .where(
+      and(
+        eq(shareLinks.householdId, household.id),
+        eq(shareLinks.entityType, entityType),
+        eq(shareLinks.entityId, entityId),
+        isNull(shareLinks.revokedAt),
+      ),
+    )
+    .orderBy(shareLinks.createdAt);
+
+  return rows
+    .filter((r) => !r.expiresAt || r.expiresAt > now)
+    .map((r) => ({
+      id: r.id,
+      createdAt: r.createdAt.toISOString(),
+      expiresAt: r.expiresAt?.toISOString() ?? null,
+      capabilities: r.capabilities,
+    }));
+}
+
 export async function getActiveShareLinks(): Promise<ActiveShareLink[]> {
   const { household } = await getCurrentSession();
   const now = new Date();