fix(rooms): upgrading a room keeps its Lotus settings (#327)

POST /rooms/{id}/upgrade copies only Synapse's fixed list of state, so an
upgrade silently dropped everything Lotus keeps in room state: an
audio-only voice channel became camera/screenshare-allowed, user limits
and bitrate caps vanished, the soundboard pack was lost, and a room set
to delete messages after 7 days kept new ones forever.

RoomUpgrade now reads the client-owned state first (utils/roomUpgradeState,
unit-tested: io.lotus.*, m.room.retention, role tags, room emoji packs)
and re-creates it in the replacement room; a partial copy is reported in
the dialog instead of closing silently.

Verified headless through the UI (v10 room with voice limit, quality
policy, a soundboard pack and retention → upgrade): before, none
survived; now all four are in the new room.

Follow-up (not here): for spaces, the children's m.space.parent still
point at the old space.

Fixes #327

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/utils/roomUpgradeState.test.ts

@@ -0,0 +1,35 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { isCarriedStateType, stateToCarry } from './roomUpgradeState';
+
+const ev = (type: string, content: Record<string, unknown>, stateKey = '') => ({
+  getType: () => type,
+  getStateKey: () => stateKey,
+  getContent: () => content,
+});
+
+test('Lotus room state is carried; state Synapse already copies is not (#327)', () => {
+  assert.equal(isCarriedStateType('io.lotus.voice_limit'), true);
+  assert.equal(isCarriedStateType('io.lotus.room_quality'), true);
+  assert.equal(isCarriedStateType('io.lotus.soundboard'), true);
+  assert.equal(isCarriedStateType('m.room.retention'), true);
+  assert.equal(isCarriedStateType('in.cinny.room.power_level_tags'), true);
+  assert.equal(isCarriedStateType('im.ponies.room_emotes'), true);
+  assert.equal(isCarriedStateType('m.room.power_levels'), false);
+  assert.equal(isCarriedStateType('m.room.name'), false);
+  assert.equal(isCarriedStateType('m.room.member'), false);
+});
+
+test('stateToCarry keeps state keys and skips emptied events', () => {
+  const out = stateToCarry([
+    ev('io.lotus.voice_limit', { max_users: 5 }),
+    ev('io.lotus.soundboard', { clips: [1] }, 'pack-a'),
+    ev('io.lotus.room_quality', {}),
+    ev('m.room.name', { name: 'x' }),
+    ev('m.room.retention', { max_lifetime: 604800000 }),
+  ]);
+  assert.deepEqual(
+    out.map((s) => `${s.type}|${s.stateKey}`),
+    ['io.lotus.voice_limit|', 'io.lotus.soundboard|pack-a', 'm.room.retention|'],
+  );
+});

src/app/utils/roomUpgradeState.ts

@@ -0,0 +1,36 @@
+/**
+ * [Gitea #327] Room state Synapse does NOT copy into the replacement room on
+ * `POST /rooms/{id}/upgrade` (it carries only power levels, join rules,
+ * name/topic/avatar, history visibility, guest access, encryption, server ACL
+ * and space parent/child). Lotus keeps call policy, voice limits, soundboard,
+ * message retention, role tags and room emoji packs in state, so an upgrade
+ * silently dropped all of them.
+ */
+const CARRIED_TYPES = new Set([
+  'm.room.retention',
+  'in.cinny.room.power_level_tags',
+  'im.ponies.room_emotes',
+]);
+const CARRIED_PREFIXES = ['io.lotus.'];
+
+export type StateToCarry = { type: string; stateKey: string; content: Record<string, unknown> };
+
+export const isCarriedStateType = (type: string): boolean =>
+  CARRIED_TYPES.has(type) || CARRIED_PREFIXES.some((p) => type.startsWith(p));
+
+/** The state events to re-create in the replacement room (non-empty content only). */
+export const stateToCarry = (
+  events: Array<{
+    getType: () => string;
+    getStateKey: () => string | undefined;
+    getContent: () => Record<string, unknown>;
+  }>,
+): StateToCarry[] =>
+  events
+    .filter((ev) => isCarriedStateType(ev.getType()))
+    .map((ev) => ({
+      type: ev.getType(),
+      stateKey: ev.getStateKey() ?? '',
+      content: ev.getContent(),
+    }))
+    .filter((s) => s.content && Object.keys(s.content).length > 0);