Stabilize chat read-state effect against snapshot reloads

useSnapshot now memoizes the actions object so dependants don't see a
fresh reference on every render. ChatPage's mark-read effect keys off
activeSpaceId/latestActiveMessageId primitives instead of the snapshot
objects that re-allocate on reload, which prevents the markRead → reload
→ rerender loop that was deadlocking the Electron click path under
Playwright.

Also constrains HomePage agenda time to same-day activity so the
'Today' column doesn't surface a meaningless wall-clock for older tasks.

AgentCompany-New/src/renderer/src/app/useSnapshot.ts

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useMemo, useState } from "react";
 import type { AppSnapshot } from "../../../shared/domain";
 import type { DesktopResult } from "../../../shared/result";
 
@@ -35,5 +35,6 @@ export function useSnapshot(): {
     });
   }, [load]);
 
-  return { snapshot, actions: { run, reload: load } };
+  const actions = useMemo<SnapshotActions>(() => ({ run, reload: load }), [run, load]);
+  return { snapshot, actions };
 }

AgentCompany-New/src/renderer/src/pages/ChatPage.tsx

@@ -47,20 +47,20 @@ export function ChatPage({ snapshot, actions }: PageProps) {
     : fallbackSpaceId;
   const activeSpace = spaces.find((space) => space.id === activeSpaceId) ?? null;
   const latestActiveMessageId = useMemo(() => {
-    if (!activeSpace) return null;
-    const inSpace = messagesAll.filter((message) => message.spaceId === activeSpace.id);
+    if (!activeSpaceId) return null;
+    const inSpace = messagesAll.filter((message) => message.spaceId === activeSpaceId);
     if (inSpace.length === 0) return null;
     return inSpace[inSpace.length - 1].id;
-  }, [messagesAll, activeSpace]);
+  }, [messagesAll, activeSpaceId]);
 
   useEffect(() => {
-    if (!activeSpace || !latestActiveMessageId) return;
+    if (!activeSpaceId || !latestActiveMessageId) return;
     void actions.run(() => window.agentCompany.markChatSpaceRead({
       orgId,
       employeeId: employee.id,
-      spaceId: activeSpace.id,
+      spaceId: activeSpaceId,
     }));
-  }, [activeSpace, latestActiveMessageId, orgId, employee.id, actions]);
+  }, [activeSpaceId, latestActiveMessageId, orgId, employee.id, actions]);
 
   const messagesInSpace = useMemo(
     () => (activeSpace ? messagesAll.filter((m) => m.spaceId === activeSpace.id) : []),

AgentCompany-New/src/renderer/src/pages/HomePage.tsx

@@ -102,7 +102,7 @@ function TodayCard({
         {rows.map((task) => {
           const owner = agents.find((agent) => agent.id === task.assigneeAgentId);
           const ownerName = owner?.name ?? employee.displayName;
-          const time = formatTime(task.updatedAt);
+          const time = agendaTime(task, date);
           const requiresApproval = approvals.some((approval) => approval.title === task.title);
           return (
             <div key={task.id} className="row" style={{ gap: 12 }}>
@@ -279,6 +279,17 @@ function GoalCard({
   );
 }
 
+function agendaTime(task: TaskRecord, reference: Date): string {
+  const updated = new Date(task.updatedAt);
+  if (Number.isNaN(updated.getTime())) return "—";
+  const sameDay =
+    updated.getFullYear() === reference.getFullYear() &&
+    updated.getMonth() === reference.getMonth() &&
+    updated.getDate() === reference.getDate();
+  if (!sameDay) return "—";
+  return formatTime(task.updatedAt);
+}
+
 function collectAgendaTasks(tasks: TaskRecord[], reference: Date): TaskRecord[] {
   const startOfDay = new Date(reference.getFullYear(), reference.getMonth(), reference.getDate()).getTime();
   const endOfDay = startOfDay + 24 * 60 * 60 * 1000;