feat(x): ambient meeting detection + take-notes popup (Granola parity phase 2)

- mic-monitor Swift helper: polls CoreAudio for mic-in-use, with owning
  PIDs on macOS 14.4+ (process-object API) so calls attribute to the app
  that actually holds the mic (Chrome vs Zoom vs Slack); no TCC permission
  needed. Compiled best-effort by bundle.mjs; exits when stdin closes
- core meetings/detector: 5s mic debounce, PID→process attribution with
  running-app fallback, Granola labels (Huddle/Call/Meeting detected),
  calendar merge (event start −15min through end), once per mic session
  (30s idle reset), suppressed while Rowboat itself captures (recording
  or assistant voice call), gated by a meeting_detection notification
  category (Settings > Notifications)
- popup: lean Granola-style bar (title + platform + Take notes pill,
  floating ×) in a transparent non-activating panel at screen-saver level
  with fullscreen-auxiliary behavior — floats over fullscreen meetings on
  the cursor's display; activation policy restored immediately so the
  Dock icon survives and Take Notes can foreground Rowboat
- Take Notes routes into the existing take-meeting-notes flow with a
  synthetic or matched calendar event (source: detected); never records
  without a click
- tray icon bumped to 18pt

apps/x/packages/shared/src/ipc.ts

@@ -734,6 +734,9 @@ const ipcSchemas = {
       // When true, the renderer should also open the meeting URL (Zoom/Meet/etc.)
       // in addition to triggering the take-notes flow.
       openMeeting: z.boolean().optional(),
+      // Origin recorded in the note frontmatter: 'calendar-sync' (default) for
+      // notification/deep-link starts, 'detected' for ambient meeting detection.
+      source: z.string().optional(),
     }),
     res: z.null(),
   },
@@ -783,6 +786,48 @@ const ipcSchemas = {
       success: z.literal(true),
     }),
   },
+  // Renderer → main: assistant voice/video call holds the mic — suppresses
+  // ambient meeting detection (it would otherwise see our own capture).
+  'voice:setCallActive': {
+    req: z.object({
+      active: z.boolean(),
+    }),
+    res: z.object({
+      success: z.literal(true),
+    }),
+  },
+  // --- Ambient meeting detection popup (own always-on-top window) ---
+  // Main → popup: the detection to display.
+  'meetingDetect:payload': {
+    req: z.object({
+      title: z.string(),
+      message: z.string(),
+      // Calendar-linked detections render a solid accent bar; ad-hoc ones a
+      // dashed one (Granola's affordance).
+      hasCalendarEvent: z.boolean(),
+    }),
+    res: z.null(),
+  },
+  // Popup → main: fetch the payload (the push can race listener registration).
+  'meetingDetect:getPayload': {
+    req: z.null(),
+    res: z.object({
+      payload: z
+        .object({
+          title: z.string(),
+          message: z.string(),
+          hasCalendarEvent: z.boolean(),
+        })
+        .nullable(),
+    }),
+  },
+  // Popup → main: user clicked a button.
+  'meetingDetect:action': {
+    req: z.object({
+      action: z.enum(['take-notes', 'dismiss']),
+    }),
+    res: z.object({}),
+  },
   'granola:getConfig': {
     req: z.null(),
     res: z.object({

apps/x/packages/shared/src/notification-settings.ts

@@ -7,12 +7,14 @@ import { z } from 'zod';
  * - new_email:        a new email arrived during incremental Gmail sync
  * - agent_permission: an agent is requesting permission to run a tool
  * - background_task:  a background task agent pinged via the notify-user tool
+ * - meeting_detection: popup when Rowboat detects you're in a call/meeting
  */
 export const NotificationCategorySchema = z.enum([
   'chat_completion',
   'new_email',
   'agent_permission',
   'background_task',
+  'meeting_detection',
 ]);
 
 export const NotificationCategoriesSchema = z.object({
@@ -20,6 +22,7 @@ export const NotificationCategoriesSchema = z.object({
   new_email: z.boolean(),
   agent_permission: z.boolean(),
   background_task: z.boolean(),
+  meeting_detection: z.boolean(),
 });
 
 export const NotificationSettingsSchema = z.object({
@@ -32,6 +35,7 @@ export const DEFAULT_NOTIFICATION_SETTINGS: NotificationSettings = {
     new_email: true,
     agent_permission: true,
     background_task: true,
+    meeting_detection: true,
   },
 };