JP reported (Chrome) after b43e649:
- Sidebar buttons render ✓
- Adwright: useless middle black panel between sidebar and right area
- BTE: entire left sidebar disappears, only close-X recovers it
ROOT CAUSES:
1. webui CSS has `main.main:not(.showing-X):not(.showing-Y)... > #mainChat
{ display:flex }` which still matches when our class is svrnty-showing-*
(not in webui's whitelist). Chat rendered alongside our panel → the
empty void = "middle black panel".
2. BTE overlay was `position:fixed; inset:0; z-index:9991` — covered the
whole viewport including sidebar + topbar.
FIXES:
- Adwright + BTE CSS now `main.main.svrnty-showing-<id> > .main-view
{ display:none !important }` — explicitly hides every native main-view
(mainChat, mainSkills, mainTasks, ...) when our panel is active.
- BTE.css: overlay no longer position:fixed. Becomes a normal flex child
of main when svrnty-showing-bte is active. Sidebar + topbar stay visible.
- bte.js: _openOverlay now appends to <main class="main"> instead of
document.body. Migrates existing body-mounted overlay on first open.
Karpathy 4 rules: root-caused via direct CSS inspection (not guessing),
two-line CSS change per panel, no new abstractions.
69e575ca59