Replace playstyle rules with free-text custom rules markdown field

Remove hardcoreMode, setModeOnly, and bossTeamMatch toggles which had
no mechanical impact on the tracker. Replace them with a customRules
markdown field so users can document their own rules (especially useful
for genlockes). Add react-markdown + remark-gfm for rendering and
@tailwindcss/typography for prose styling. The custom rules display is
collapsible and hidden by default.

Also simplifies the BossDefeatModal by removing the Lost result and
attempts counter, and always shows boss team size in the level cap bar.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/types/rules.ts

@@ -7,11 +7,6 @@ export interface NuzlockeRules {
   pinwheelClause: boolean
   levelCaps: boolean
 
-  // Playstyle (informational, for stats/categorization)
-  hardcoreMode: boolean
-  setModeOnly: boolean
-  bossTeamMatch: boolean
-
   // Variant (changes which Pokemon can appear)
   egglocke: boolean
   wonderlocke: boolean
@@ -19,10 +14,13 @@ export interface NuzlockeRules {
 
   // Type restriction (monolocke and variants)
   allowedTypes: string[]
+
+  // Free-text rules (markdown, for tracking custom/personal rules)
+  customRules: string
 }
 
-/** Keys of NuzlockeRules that are boolean toggles (excludes array fields) */
-type BooleanRuleKeys = Exclude<keyof NuzlockeRules, 'allowedTypes'>
+/** Keys of NuzlockeRules that are boolean toggles (excludes array and string fields) */
+type BooleanRuleKeys = Exclude<keyof NuzlockeRules, 'allowedTypes' | 'customRules'>
 
 export const DEFAULT_RULES: NuzlockeRules = {
   // Core rules
@@ -33,11 +31,6 @@ export const DEFAULT_RULES: NuzlockeRules = {
   pinwheelClause: true,
   levelCaps: false,
 
-  // Playstyle - off by default
-  hardcoreMode: false,
-  setModeOnly: false,
-  bossTeamMatch: false,
-
   // Variant - off by default
   egglocke: false,
   wonderlocke: false,
@@ -45,13 +38,16 @@ export const DEFAULT_RULES: NuzlockeRules = {
 
   // Type restriction - no restriction by default
   allowedTypes: [],
+
+  // Custom rules - empty by default
+  customRules: '',
 }
 
 export interface RuleDefinition {
   key: BooleanRuleKeys
   name: string
   description: string
-  category: 'core' | 'playstyle' | 'variant'
+  category: 'core' | 'variant'
 }
 
 export const RULE_DEFINITIONS: RuleDefinition[] = [
@@ -99,28 +95,6 @@ export const RULE_DEFINITIONS: RuleDefinition[] = [
     category: 'core',
   },
 
-  // Playstyle
-  {
-    key: 'hardcoreMode',
-    name: 'Hardcore Mode',
-    description: 'No items may be used during battle. Held items are still allowed.',
-    category: 'playstyle',
-  },
-  {
-    key: 'setModeOnly',
-    name: 'Set Mode Only',
-    description:
-      'The game must be played in "Set" battle style, meaning you cannot switch Pokémon after knocking out an opponent.',
-    category: 'playstyle',
-  },
-  {
-    key: 'bossTeamMatch',
-    name: 'Boss Team Match',
-    description:
-      'Limit your active party to the same number of Pokémon as the boss you are challenging.',
-    category: 'playstyle',
-  },
-
   // Variant
   {
     key: 'egglocke',