Add static clause rule for encounter selector filtering

When disabled, static encounters (legendaries, scripted Pokémon) are
grayed out and unselectable in the encounter selector. Enabled by default.
Adds 'static' to METHOD_CONFIG/METHOD_ORDER with a teal badge.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/types/rules.ts

@@ -3,6 +3,7 @@ export interface NuzlockeRules {
   duplicatesClause: boolean
   shinyClause: boolean
   giftClause: boolean
+  staticClause: boolean
   pinwheelClause: boolean
   levelCaps: boolean
 
@@ -22,6 +23,7 @@ export const DEFAULT_RULES: NuzlockeRules = {
   duplicatesClause: true,
   shinyClause: true,
   giftClause: false,
+  staticClause: true,
   pinwheelClause: true,
   levelCaps: false,
 
@@ -66,6 +68,13 @@ export const RULE_DEFINITIONS: RuleDefinition[] = [
       "In-game gift Pokémon (starters, trades, fossils) do not count against a location's encounter limit.",
     category: 'core',
   },
+  {
+    key: 'staticClause',
+    name: 'Static Clause',
+    description:
+      'Static encounters (legendaries, scripted Pokémon) are available in the encounter selector. Disable to skip them and treat the next wild encounter as your pick.',
+    category: 'core',
+  },
   {
     key: 'pinwheelClause',
     name: 'Pinwheel Clause',