0.2.3 — built-in code editor, .uasset previews, new icon

- Built-in code editor: edit working-copy source files in place (Edit → textarea
  → Save) before committing, no external IDE needed. Backend write_depot opens
  the file for edit, clears read-only, writes UTF-8; confined to the client root.
- .uasset previews: pull the embedded Unreal thumbnail (PNG) server-side for both
  working copy and history; on-demand real 3D via a headless Unreal FBX export
  (commandlet mode, no editor window), temp file deleted right after — nothing
  cached on disk. Plugin content paths mapped to their mount point.
- New app icon (brand mark on a theme tile) + theme-aware in-app logo.
- Connection pill / Settings show the actual connected server (P4PORT), not the
  server's internal self-reported address.
- Fix: the "select all" checkbox no longer renders as a giant empty square when
  not everything is selected (size pinned).
- IDE picker chooses which installed editor opens code; AI replies in UI language.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/App.css

@@ -9,6 +9,7 @@
   --bar:rgba(255,255,255,.015);--shadow:0 40px 90px -30px rgba(0,0,0,.7);
   --sunk:rgba(0,0,0,.15);--chip:rgba(0,0,0,.4);--hover:rgba(255,255,255,.05);
   --diff-add-c:#a8ecca;--diff-del-c:#f3a9b8;
+  --logo-bg:#0c0e1a;--logo-ring:rgba(124,110,246,.28);
   --font:"Segoe UI Variable Text","Segoe UI",-apple-system,BlinkMacSystemFont,system-ui,"Helvetica Neue",Arial,sans-serif;
   --mono:"Cascadia Code","JetBrains Mono",ui-monospace,"SF Mono",Consolas,monospace;
 }
@@ -23,6 +24,7 @@ body.light{
   --bar:rgba(0,0,0,.015);--shadow:0 40px 90px -30px rgba(60,60,90,.35);
   --sunk:transparent;--chip:rgba(255,255,255,.72);--hover:rgba(0,0,0,.045);
   --diff-add-c:#137a4e;--diff-del-c:#c02b52;
+  --logo-bg:#e9f4ff;--logo-ring:rgba(124,110,246,.22);
 }
 *{box-sizing:border-box;margin:0;padding:0}
 html,body,#root{height:100%}
@@ -48,9 +50,10 @@ button{font-family:var(--font)}
 .wbtn.close:hover{background:#e81123;color:#fff}
 .wbtn svg{width:11px;height:11px}
 .brand{display:flex;align-items:center;gap:10px;padding-right:10px;margin-right:4px;border-right:1px solid var(--border-soft)}
-.logo{width:22px;height:22px;border-radius:7px;background:linear-gradient(145deg,var(--accent-2),var(--accent-deep));
-  box-shadow:0 0 14px rgba(124,110,246,.55);display:grid;place-items:center;flex:0 0 auto}
-.logo svg{width:13px;height:13px}
+/* theme-aware brand tile: dark tile in dark theme, light tile in light theme */
+.logo{width:24px;height:24px;border-radius:8px;background:var(--logo-bg);
+  box-shadow:inset 0 0 0 1px var(--logo-ring),0 2px 8px rgba(0,0,0,.28);display:grid;place-items:center;flex:0 0 auto}
+.logo .exlogo{width:18px;height:18px}
 .app-name{font-size:13px;font-weight:600;white-space:nowrap}.app-name span{color:var(--faint);font-weight:500}
 .conn-pill{align-self:center;margin-left:auto;display:flex;align-items:center;gap:8px;font-size:11.5px;color:var(--muted);
   background:rgba(62,207,142,.08);border:1px solid rgba(62,207,142,.2);padding:4px 10px;border-radius:20px;white-space:nowrap}
@@ -577,6 +580,21 @@ body.resizing-v{cursor:row-resize!important;user-select:none}
 .code-body code{white-space:pre;font-family:inherit;background:none;padding:0}
 .code.added .code-body{background:rgba(62,207,142,.04)}
 
+/* built-in code editor */
+.cb-badge.editing{color:var(--edit);background:rgba(232,176,75,.16)}
+.ce-actions{margin-left:auto;display:flex;gap:8px;align-items:center}
+.ce-btn{display:flex;align-items:center;gap:6px;font-size:11.5px;font-weight:600;font-family:var(--font);cursor:pointer;
+  color:var(--muted);background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:5px 11px;transition:.15s}
+.ce-btn:hover:not(:disabled){color:var(--txt);border-color:var(--accent)}
+.ce-btn:disabled{opacity:.5;cursor:default}
+.ce-btn.save{color:#fff;border:none;background:linear-gradient(135deg,var(--accent-2),var(--accent-deep))}
+.ce-btn.save:hover:not(:disabled){filter:brightness(1.1)}
+.ce-btn svg{width:13px;height:13px}
+.code-edit{flex:1;min-height:0;width:100%;resize:none;border:none;outline:none;
+  font-family:var(--mono);font-size:12.5px;line-height:1.7;tab-size:4;color:var(--txt);
+  background:var(--stage-bg);padding:12px 16px;white-space:pre;overflow:auto}
+.code-edit:focus{box-shadow:inset 3px 0 0 var(--accent)}
+
 /* highlight.js tokens mapped to the app palette (theme-aware) */
 .hljs{color:var(--txt);background:none}
 .hljs-comment,.hljs-quote{color:var(--faint);font-style:italic}
@@ -726,6 +744,14 @@ body.resizing-v{cursor:row-resize!important;user-select:none}
 .explain-x{flex:0 0 auto;border:none;background:none;color:var(--faint);font-size:18px;line-height:1;cursor:pointer;padding:0 2px}
 .explain-x:hover{color:var(--txt)}
 
+/* "Load 3D model" button in the .uasset preview */
+.load3d{position:absolute;bottom:16px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:8px;
+  font-size:12.5px;font-weight:600;font-family:var(--font);color:#fff;cursor:pointer;padding:9px 16px;border-radius:10px;border:none;
+  background:linear-gradient(135deg,var(--accent-2),var(--accent-deep));box-shadow:0 8px 24px -8px rgba(124,110,246,.7);transition:.15s}
+.load3d:hover:not(:disabled){filter:brightness(1.1)}
+.load3d:disabled{opacity:.5;cursor:default;box-shadow:none}
+.load3d svg{width:15px;height:15px}
+
 /* ---------------- collaboration UI (locks / banners / search / blame / diff / resolve) ---------------- */
 /* connection + resolve banners */
 .netbar{display:flex;align-items:center;gap:10px;padding:8px 16px;font-size:12.5px;font-weight:600;flex:0 0 auto}