ui/phase-9: revert premature done-mark, reuse minScaleNoWrap

Previous Phase 9 commit pre-marked PLAN.md with "Status: done"
before the local-ci gate ran green. Project rule
(galaxy/CLAUDE.md "Per-stage CI gate") allows the marker only
after the run is success; revert to "Status: pending".

Also folds the inline minScale formula in the playground page
into a call to map/no-wrap.ts:minScaleNoWrap so the playground
and the renderer share one source of truth for the floor.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/PLAN.md

@@ -952,9 +952,9 @@ Targeted tests (delivered):
   invitation removes card and adds the game to My Games. Phase 7
   auth flow now also runs over the FlatBuffers wire.
 
-## ~~Phase 9. Map Renderer with Fixture Data~~
+## Phase 9. Map Renderer with Fixture Data
 
-Status: done.
+Status: pending.
 
 Goal: stand up the PixiJS map renderer with pan/zoom, primitive
 drawing, torus wrap behaviour and bounded-plane (no-wrap) mode against