Add item/property tooltip metadata and schema-driven ranges

docs/controls.md

@@ -61,6 +61,7 @@ Applies to effect select, user/item list modes, item selection, item property li
 - `ArrowUp` / `ArrowDown`: Move selection
 - `Enter`: Confirm selection
 - `Escape`: Exit/cancel
+- `Space`: Read tooltip/help for current option (where metadata is available)
 - First-letter navigation: jump to next matching entry
 
 ## Help Viewer Mode

docs/protocol-notes.md

@@ -40,8 +40,10 @@ This is a behavior guide for packet semantics beyond raw schemas.
 - `welcome.worldConfig.gridSize`: server-authoritative grid size used by clients for bounds/drawing.
 - `welcome.uiDefinitions`: server-provided item UI definitions:
   - `itemTypeOrder`: add-item menu order
+  - `itemTypes[].tooltip`: item-level tooltip/help text
   - `itemTypes[].editableProperties`: editable property keys by item type
   - `itemTypes[].propertyOptions`: menu options for property keys (for example clock `timeZone`)
+  - `itemTypes[].propertyMetadata`: property-level metadata (`valueType`, optional `range`, optional `tooltip`)
   - `itemTypes[].globalProperties`: non-editable global values (`useSound`, `emitSound`, `useCooldownMs`)
 
 - Clients keep local fallback defaults but should prefer server-provided metadata when present.