feat(magic): reorder schools, fix Wu Xing aspect & power formula

- `magicOrder` ArrayField + ▲/▼ buttons for manual reordering
- Magic rolls use school's aspect for Wu Xing, not speciality's element
- Spell power: `difficulty × (aspectValue + freePowerLevels)` (not `successes × diff`)
- Prompt replaces `aspectspeciality`/`bonusmalusspeciality`/`heispend` with `freepowerlevels`

fix: code review issues
- combat.js: guard undefined `ids` in rollInitiative
- rolling.js: catch Dice So Nice promise, normalize French→English kungfu aspects
- weapon/armor/ingredient: `{ min: 0 }` on quantity
- character.js/npc.js: catch rollForActor fire-and-forget promises
- roll-actions.js/tinji-app.js: await ChatMessage.create
- sanhei.js: null guard on properties
- spell.js/kungfu.js: fix aspect name comments (French→English)

src/ui/sheets/items/sanhei.js

@@ -26,11 +26,11 @@ export class CDESanheiSheet extends CDEBaseItemSheet {
   async _prepareContext() {
     const context = await super._prepareContext()
     const enrich = (content) => foundry.applications.ux.TextEditor.implementation.enrichHTML(content ?? "", { async: true })
-    const props = this.document.system.properties
-    context.prop1DescriptionHTML = await enrich(props.prop1.description)
-    context.prop2DescriptionHTML = await enrich(props.prop2.description)
-    context.prop3DescriptionHTML = await enrich(props.prop3.description)
-    context.propFields = this.document.system.schema.fields.properties.fields
+    const props = this.document.system.properties ?? {}
+    context.prop1DescriptionHTML = await enrich(props.prop1?.description)
+    context.prop2DescriptionHTML = await enrich(props.prop2?.description)
+    context.prop3DescriptionHTML = await enrich(props.prop3?.description)
+    context.propFields = this.document.system.schema.fields.properties?.fields
     return context
   }
 }