fix(ws): re-attach stateChange listeners when bot instance is replaced

startBot creates a fresh BotInstance but the WS layer keyed its listener
map by bot.id, so ensureAllBotsAttached skipped the new object and
stateChange events were never broadcast — the player bar only appeared
after a manual refresh. BotManager now extends EventEmitter and emits
"botInstance" whenever a new bot object is created; websocket.ts stores
the bot reference, detaches on replacement, and subscribes to the event
for immediate wiring.

Also enlarges the bot selector (padding 10×20, font 16, min-height 44,
bigger dot/chevron/state icons, wider name) and adds Playwright repro
scripts for the player bar bug and navbar sizing check.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -6,3 +6,5 @@ dist/
 config.json
 cookies/
 .superpowers/
+/bin/
+scripts/navbar_bigger.png