feat: add daily brief functionality and integrate into AI chat panel

src/main/ai/orchestrator.ts

@@ -946,3 +946,27 @@ export async function orchestrate(input: OrchestrateInput): Promise<OrchestrateR
     return { response: '', error: errMsg };
   }
 }
+
+// ---------------------------------------------------------------------------
+// Daily Brief (dedicated entry point)
+// ---------------------------------------------------------------------------
+
+const DAILY_BRIEF_PROMPT =
+`Act as a professional and efficient executive assistant. Give me a concise daily brief for today. 
+
+Strict Rules:
+- Adopt a polite, formal, and helpful tone. Do not use emojis, slang, or overly casual encouragement.
+- Focus strictly on actionable or critical items: tasks due today, upcoming deadlines this week, overdue items, and significant project activity. 
+- Do NOT mention zero-counts (e.g., "no overdue items") or general statistics (e.g., "2 active projects", "2 completed tasks"). Only report what needs my attention.
+- Do NOT include any headers, titles, dates, or greetings.
+- Do NOT use labels like "Due today:" or "Overdue:". Integrate the information naturally into sentences.
+- Use **bold** for key phrases, task names, or project names.
+- Keep the entire response to 3-5 sentences.`;
+
+export async function dailyBrief(sender?: Electron.WebContents): Promise<OrchestrateResult> {
+  return orchestrate({
+    message: DAILY_BRIEF_PROMPT,
+    context: { type: 'global' },
+    sender,
+  });
+}