feat: journal dashboard widgets, agent polish, and edit-mode live previews

Journal dashboard widgets and quick-add; rich-text quick-add dialogs.

Dashboard draft sync for live edit previews; assistant bubble + API tools.

Journal UX: stress slider, mood grid, query cap fix.

src/app/api/v1/share-links/route.ts

@@ -0,0 +1,55 @@
+import { z } from "zod";
+import { apiJson, withApiHandler } from "@/lib/api-handler";
+import {
+  createShareLinkForScope,
+  listShareLinksForScope,
+  listShareableEntityTypes,
+} from "@/modules/_core/share-api";
+
+const createShareLinkInput = z.object({
+  entityType: z.string().trim().min(1),
+  entityId: z.string().uuid(),
+  expiresAt: z.string().datetime().nullable().optional(),
+  capabilities: z
+    .object({
+      read: z.boolean().optional(),
+      write: z.boolean().optional(),
+    })
+    .optional(),
+});
+
+export async function GET(request: Request) {
+  return withApiHandler(request, async (scope, req) => {
+    const url = new URL(req.url);
+    const entityType = url.searchParams.get("entityType") ?? undefined;
+    const entityId = url.searchParams.get("entityId") ?? undefined;
+
+    if (url.searchParams.get("entityTypes") === "true") {
+      return apiJson(listShareableEntityTypes());
+    }
+
+    const links = await listShareLinksForScope(scope, { entityType, entityId });
+    return apiJson(links);
+  });
+}
+
+export async function POST(request: Request) {
+  return withApiHandler(request, async (scope, req) => {
+    const body: unknown = await req.json();
+    const parsed = createShareLinkInput.parse(body);
+    const expiresAt = parsed.expiresAt ? new Date(parsed.expiresAt) : null;
+
+    const result = await createShareLinkForScope(scope, parsed.entityType, parsed.entityId, {
+      expiresAt,
+      capabilities: parsed.capabilities,
+    });
+
+    return apiJson(
+      {
+        url: result.url,
+        expiresAt: result.expiresAt?.toISOString() ?? null,
+      },
+      201,
+    );
+  });
+}