feat(meetings): editable title header above the transcript/notes pane

Nothing in the UI displayed or let you change a meeting's title
outside the sidebar list — recordings default to "Untitled meeting"
with no way to fix that. Adds an inline-editable header; blur/change
commits the rename.

src/lib/views/TranscriptNotes.svelte

@@ -43,6 +43,19 @@
     }
   });
 
+  // Recordings default to "Untitled meeting" (T2.2) — this is the only
+  // rename affordance, since nothing else in the UI shows the title at all.
+  async function onTitleChange(e: Event) {
+    const m = meetings.selected;
+    const value = (e.target as HTMLInputElement).value.trim();
+    if (!m) return;
+    if (!value) {
+      (e.target as HTMLInputElement).value = m.title; // revert an empty edit
+      return;
+    }
+    if (value !== m.title) await meetings.renameMeeting(m.id, value);
+  }
+
   function scheduleSave() {
     const id = meetings.selected?.id;
     if (!id) return;
@@ -128,6 +141,12 @@
 <div class="wrap">
   {#if meetings.selected}
     {@const m = meetings.selected}
+    <input
+      class="meeting-title"
+      value={m.title}
+      onchange={onTitleChange}
+      aria-label="Meeting title"
+    />
     <div class="split">
       <div class="pane transcript">
         <h4><MessageSquareText size={14} aria-hidden="true" /> Transcript</h4>
@@ -229,6 +248,22 @@
 <style>
   .wrap {
     height: 100%;
+    display: flex;
+    flex-direction: column;
+  }
+  .meeting-title {
+    flex: none;
+    border: none;
+    background: transparent;
+    font-size: 1.05rem;
+    font-weight: 600;
+    padding: 0.75rem 1rem 0.25rem;
+    color: inherit;
+  }
+  .meeting-title:hover,
+  .meeting-title:focus {
+    background: var(--border);
+    outline: none;
   }
   .pad {
     padding: 1rem;
@@ -249,7 +284,8 @@
   .split {
     display: grid;
     grid-template-columns: 1fr 1fr;
-    height: 100%;
+    flex: 1;
+    min-height: 0;
   }
   .pane {
     overflow: auto;