Improve pet habitat UX with ground-aligned walk, floating rename, and demo points.

Anchor room floors on resize, constrain wandering to a ground zone, add an editable floating name badge on the avatar screen, and let profile demo tools grant 100 test points.

lib/coins.ts

@@ -1,5 +1,8 @@
 export const DEFAULT_STARTING_COINS = 100;
 
+/** Demo grant amount from Profile → Demo tools. */
+export const DEMO_COINS_GRANT = 100;
+
 export const COINS_PER_TASK_COMPLETE = 50;
 export const COINS_PER_TASK_UNCHECK = -50;
 

lib/pet-wander-bounds.ts

@@ -1,14 +1,17 @@
-/** Percentage bounds for pet wander within the LCD viewport. */
+/** Ground band height as a fraction of the LCD — matches room PNG floor (~bottom 22%). */
+export const PET_GROUND_ZONE_HEIGHT_RATIO = 0.22;
+
+/** Wander bounds inside the ground zone (not the full LCD). */
 export const PET_WANDER_BOUNDS = {
   /** Horizontal inset — keep pet off side walls */
   minX: 15,
   maxX: 85,
-  /** Lower third of LCD — ground where hills/grass/floor render */
-  minY: 66,
-  maxY: 90,
+  /** Vertical offset from floor, as % of ground zone height (0 = feet on floor) */
+  minY: 0,
+  maxY: 65,
 } as const;
 
 export const PET_WANDER_START = {
   x: 50,
-  y: 78,
+  y: 12,
 } as const;