fix(collab): deterministic nameplates — pin GAL text justify + punch chip text through the depth test

Two root causes of the wandering/invisible badge text:
- A plain VIEW_OVERLAY draws with whatever text justify the LAST painter left
  in the GAL (CENTER is only the reset default) — anchoring was
  nondeterministic. PRESENCE_OVERLAY (VIEW_OVERLAY subclass, replaces
  MakeOverlay) pins TOP-LEFT justify before executing its commands; the label
  math is written against that.
- The whole overlay draws at ONE depth and same-depth fragments drawn later
  LOSE the depth test — a chip rect over its text erased the text. Draw the
  text FIRST, the chip rect AFTER: the rect is rejected exactly on the glyph
  pixels, punching the text through.
Verified live: chips contain their names on light (dark text) and dark
(white text) user colors, for both selection tags and cursor labels.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CvqUd4QsJSGHN28aunJRTq

wasm/bindings/eeschema_embind.cpp

@@ -799,7 +799,7 @@ void redrawOverlay()
     KIGFX::VIEW* view = fr->GetCanvas()->GetView();
 
     if( !g_overlay )
-        g_overlay = view->MakeOverlay();
+        g_overlay = pcbjam_presence::makePresenceOverlay( view );
 
     g_overlay->Clear();