feat(ui): recording store gains live notes state

notesText (debounced save, flushed on stop before finalize reads it),
segmentNotes Map keyed by anchor_ms, setNotesText/setSegmentNote.

src/lib/stores/recording.svelte.ts

@@ -3,6 +3,7 @@
 
 import { api, events, type TranscriptSegment, type MeetingId } from "../api";
 import { settings } from "./settings.svelte";
+import { SvelteMap } from "svelte/reactivity";
 
 class RecordingStore {
   meetingId = $state<MeetingId | null>(null);
@@ -16,6 +17,11 @@ class RecordingStore {
   levelPeak = $state(0);
   /** Set while a capture-device reconnect is in progress; cleared on recovery (FR-CAP-6). */
   deviceNotice = $state<string | null>(null);
+  /** Live notes redesign: freeform text typed in the Notes pane while recording. */
+  notesText = $state("");
+  /** anchor_ms (a segment's start_ms) -> note text, for moments annotated this recording. */
+  segmentNotes = new SvelteMap<number, string>();
+  private notesSaveTimer: ReturnType<typeof setTimeout> | null = null;
 
   async init() {
     await events.onRecordingState((p) => {
@@ -53,6 +59,8 @@ class RecordingStore {
     this.segments = [];
     this.retention = record;
     this.deviceNotice = null;
+    this.notesText = "";
+    this.segmentNotes.clear();
     // T8.7/FR-TRX-4: whatever language is currently configured in Settings
     // becomes this meeting's requested language, persisted on its record.
     const language = settings.settings.whisper_language ?? undefined;
@@ -61,6 +69,9 @@ class RecordingStore {
   }
 
   async stop() {
+    // The debounced save below can lag up to 500ms behind typing — flush
+    // whatever's pending first so stop_recording's merge sees the latest text.
+    await this.flushNotes();
     if (this.meetingId) await api.stopRecording(this.meetingId);
     this.state = "idle";
     this.levelRms = 0;
@@ -70,6 +81,10 @@ class RecordingStore {
 
   /** Abandon an accidental recording: stop capture and delete it entirely. */
   async cancel() {
+    if (this.notesSaveTimer) {
+      clearTimeout(this.notesSaveTimer);
+      this.notesSaveTimer = null;
+    }
     if (this.meetingId) await api.cancelRecording(this.meetingId);
     this.meetingId = null;
     this.segments = [];
@@ -77,6 +92,8 @@ class RecordingStore {
     this.levelRms = 0;
     this.levelPeak = 0;
     this.deviceNotice = null;
+    this.notesText = "";
+    this.segmentNotes.clear();
   }
 
   /** Toggle audio retention mid-meeting (FR-REC-1); caller must have gated consent already. */
@@ -85,6 +102,41 @@ class RecordingStore {
     await api.setRecordingRetention(this.meetingId, record);
     this.retention = record;
   }
+
+  /**
+   * Live notes redesign: freeform text typed in the Notes pane while
+   * recording. Debounced 500ms (same cadence as the post-finalize editor's
+   * `scheduleSave`) so every keystroke doesn't round-trip to the backend.
+   */
+  setNotesText(text: string) {
+    this.notesText = text;
+    if (!this.meetingId) return;
+    const meetingId = this.meetingId;
+    if (this.notesSaveTimer) clearTimeout(this.notesSaveTimer);
+    this.notesSaveTimer = setTimeout(() => {
+      this.notesSaveTimer = null;
+      api.updateLiveNotes(meetingId, text).catch(() => {});
+    }, 500);
+  }
+
+  private async flushNotes() {
+    if (this.notesSaveTimer) {
+      clearTimeout(this.notesSaveTimer);
+      this.notesSaveTimer = null;
+    }
+    if (this.meetingId) {
+      await api.updateLiveNotes(this.meetingId, this.notesText).catch(() => {});
+    }
+  }
+
+  /** Attach (or clear, with `text: ""`) a note to a clicked transcript
+   * segment's moment (the "click a transcript line, add a note" feature). */
+  async setSegmentNote(anchorMs: number, text: string) {
+    if (!this.meetingId) return;
+    if (text.trim() === "") this.segmentNotes.delete(anchorMs);
+    else this.segmentNotes.set(anchorMs, text);
+    await api.setSegmentNote(this.meetingId, anchorMs, text);
+  }
 }
 
 export const recording = new RecordingStore();