fix(dashboard): preserve store this-binding in merge-advance-events endpoint

The route was extracting getRunAuditEvents off scopedStore and calling it as
a bare function, which made this.db.prepare(...) throw. useMergeAdvanceNotice
silently swallowed the error, so the banner never rendered after merges.
Call the method on the store reference instead so this is preserved.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/dashboard/src/routes/register-task-workflow-routes.ts

@@ -518,19 +518,19 @@ export function registerTaskWorkflowRoutes(ctx: ApiRoutesContext, deps: TaskWork
     try {
       const { store: scopedStore } = await getProjectContext(req);
       const limit = parseMergeAdvanceLimit(req.query.limit);
-      const getRunAuditEvents = (scopedStore as TaskStore & {
+      const storeWithRunAudit = scopedStore as TaskStore & {
         getRunAuditEvents?: (filters: {
           taskId?: string;
           domain?: "database" | "git" | "filesystem" | "sandbox";
           mutationType?: string;
           limit?: number;
         }) => RunAuditEvent[];
-      }).getRunAuditEvents;
-      if (typeof getRunAuditEvents !== "function") {
+      };
+      if (typeof storeWithRunAudit.getRunAuditEvents !== "function") {
         throw notFound("run-audit unavailable");
       }
 
-      const advanceEvents = getRunAuditEvents({
+      const advanceEvents = storeWithRunAudit.getRunAuditEvents({
         domain: "git",
         mutationType: "merge:integration-ref-advance",
         limit,
@@ -544,7 +544,7 @@ export function registerTaskWorkflowRoutes(ctx: ApiRoutesContext, deps: TaskWork
         }
 
         let userCheckout: MergeAdvanceEvent["userCheckout"] = null;
-        const stateEvents = getRunAuditEvents({
+        const stateEvents = storeWithRunAudit.getRunAuditEvents({
           taskId: extracted.taskId,
           domain: "git",
           mutationType: "merge:integration-worktree-state",