Always show Accounts button, fix Linux CI electronDist

Show Accounts menu button even with no saved accounts so users can
add accounts from the in-game menu. Remove hardcoded electronDist
from electron-builder.yml — let electron-builder auto-detect on
Linux CI, Windows CI overrides via -c.electronDist flag.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

electron-builder.yml

@@ -1,6 +1,5 @@
 appId: com.krunkercivilian.client
 productName: Krunker Civilian Client
-electronDist: node_modules/electron/dist
 directories:
   output: out
   buildResources: build