refactor: rename Audio Room → Nest project-wide

Aligns class names, package paths, string resource keys, UI text and
intent actions with the Nests branding used by the EGG specs in
nestsClient/specs/. Mechanical rename — no behavior change.

- Folders: audiorooms/ → nests/ (5 paths across amethyst, quartz)
- 30+ class renames (AudioRoom* → Nest*, AudioRooms* → Nests*)
- String resource keys audio_room_* → nest_*
- UI strings "Audio Room"/"Audio Rooms" → "Nest"/"Nests" (incl. all locales)
- Intent extras AUDIO_ROOM_* → NEST_*
- Compose route Route.AudioRooms → Route.Nests

Spec-aligned identifiers (MeetingSpaceEvent, meetingSpaces/, the nip53*
packages) are intentionally untouched — those are NIP-53 protocol
names, not "audio room" branding.

https://claude.ai/code/session_01RDpuki4t8StSg1CZcXnV5b

nestsClient/src/commonMain/kotlin/com/vitorpamplona/nestsclient/NestsSpeaker.kt

@@ -21,7 +21,7 @@
 package com.vitorpamplona.nestsclient
 
 import com.vitorpamplona.nestsclient.audio.AudioCapture
-import com.vitorpamplona.nestsclient.audio.AudioRoomBroadcaster
+import com.vitorpamplona.nestsclient.audio.NestBroadcaster
 import com.vitorpamplona.nestsclient.audio.OpusEncoder
 import com.vitorpamplona.nestsclient.moq.MoqProtocolException
 import com.vitorpamplona.nestsclient.moq.MoqSession
@@ -133,7 +133,7 @@ sealed class NestsSpeakerState {
  * unit-test suite (`NestsSpeakerTest`) and for any future IETF
  * MoQ-transport target.
  *
- * Wraps a connected [MoqSession] and plumbs an [AudioRoomBroadcaster]
+ * Wraps a connected [MoqSession] and plumbs an [NestBroadcaster]
  * through it on [startBroadcasting]. Construction does NOT open the
  * transport.
  */
@@ -168,7 +168,7 @@ class DefaultNestsSpeaker internal constructor(
                     throw t
                 }
             val broadcaster =
-                AudioRoomBroadcaster(
+                NestBroadcaster(
                     capture = captureFactory(),
                     encoder = encoderFactory(),
                     publisher = publisher,
@@ -236,7 +236,7 @@ class DefaultNestsSpeaker internal constructor(
 }
 
 internal class DefaultBroadcastHandle(
-    private val broadcaster: AudioRoomBroadcaster,
+    private val broadcaster: NestBroadcaster,
     private val announce: MoqSession.AnnounceHandle,
     private val parent: DefaultNestsSpeaker,
 ) : BroadcastHandle {