feat: live recording meta + events viewer modal

Two finishing touches on the live-recording stack.

1. Live recording meta line. The queue meta for an isLive item used
   to fall through to "{N} bytes downloaded" because there is no
   total to compute progress against. Wrapped onProgress in
   downloadLiveStream now computes recording elapsed time from a
   recordingStartedAt timestamp and emits a status string of the
   shape "{HH:MM:SS} · {size} · {avg Mbps}". Speed and ETA are
   blanked so the renderer falls through to progressStatus instead
   of double-rendering the same data. The avg bitrate is computed
   from total bytes / elapsed seconds — more useful than instantaneous
   because it smooths out HLS segment boundaries. Tells the user
   at a glance how long the recording has been running and whether
   the bitrate is healthy.

2. Events viewer modal. Companion to the chat viewer from 4.6.8.
   Queue items with a sibling .events.jsonl get a new "View events"
   button next to "View chat". Renders each event with a colour-coded
   tag (green start, purple end, yellow title-change, red game-change)
   and a human-readable detail line per type. Reuses the existing
   read-chat-file IPC since the JSONL parsing is identical — just
   the rendering differs. Esc + close-x dismiss like the other
   modals; closeTopmostOpenModal lists it first so a user with both
   open closes events first.

DE + EN locale strings for the new button + every event-type detail
line.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/index.html

@@ -136,6 +136,16 @@
         </div>
     </div>
 
+    <!-- Events Viewer Modal -->
+    <div class="modal-overlay" id="eventsViewerModal">
+        <div class="modal" style="max-width: 700px; max-height: 80vh; display:flex; flex-direction:column;">
+            <button class="modal-close" onclick="closeEventsViewer()">x</button>
+            <h2 id="eventsViewerTitle" style="margin-top:0;">Stream events</h2>
+            <div id="eventsViewerStatus" style="color:var(--text-secondary); font-size:12px; margin-bottom:8px;"></div>
+            <div id="eventsViewerList" style="flex:1; overflow-y:auto; background: var(--bg-main); border:1px solid var(--border-soft); border-radius:6px; padding:8px;"></div>
+        </div>
+    </div>
+
     <!-- Chat Replay Viewer Modal -->
     <div class="modal-overlay" id="chatViewerModal">
         <div class="modal" style="max-width: 800px; height: 80vh; display:flex; flex-direction:column;">