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/components/BossDefeatModal.tsx

@@ -1,4 +1,4 @@
-import { type FormEvent, useState, useMemo } from 'react'
+import { type FormEvent, useMemo, useState } from 'react'
 import type { BossBattle, CreateBossResultInput } from '../types/game'
 import { ConditionBadge } from './ConditionBadge'
 
@@ -7,7 +7,6 @@ interface BossDefeatModalProps {
   onSubmit: (data: CreateBossResultInput) => void
   onClose: () => void
   isPending?: boolean
-  hardcoreMode?: boolean
   starterName?: string | null
 }
 
@@ -23,11 +22,8 @@ export function BossDefeatModal({
   onSubmit,
   onClose,
   isPending,
-  hardcoreMode,
   starterName,
 }: BossDefeatModalProps) {
-  const [result, setResult] = useState<'won' | 'lost'>('won')
-  const [attempts, setAttempts] = useState('1')
 
   const variantLabels = useMemo(() => {
     const labels = new Set<string>()
@@ -58,8 +54,8 @@ export function BossDefeatModal({
     e.preventDefault()
     onSubmit({
       bossBattleId: boss.id,
-      result: hardcoreMode ? 'won' : result,
-      attempts: hardcoreMode ? 1 : Number(attempts) || 1,
+      result: 'won',
+      attempts: 1,
     })
   }
 
@@ -113,51 +109,6 @@ export function BossDefeatModal({
         )}
 
         <form onSubmit={handleSubmit}>
-          <div className="px-6 py-4 space-y-4">
-            <div>
-              <label className="block text-sm font-medium mb-2">Result</label>
-              <div className="flex gap-2">
-                <button
-                  type="button"
-                  onClick={() => setResult('won')}
-                  className={`flex-1 px-3 py-2 text-sm font-medium rounded-md border transition-colors ${
-                    result === 'won'
-                      ? 'bg-green-600 text-white border-green-600'
-                      : 'border-border-default hover:bg-surface-2'
-                  }`}
-                >
-                  Won
-                </button>
-                {!hardcoreMode && (
-                  <button
-                    type="button"
-                    onClick={() => setResult('lost')}
-                    className={`flex-1 px-3 py-2 text-sm font-medium rounded-md border transition-colors ${
-                      result === 'lost'
-                        ? 'bg-red-600 text-white border-red-600'
-                        : 'border-border-default hover:bg-surface-2'
-                    }`}
-                  >
-                    Lost
-                  </button>
-                )}
-              </div>
-            </div>
-
-            {!hardcoreMode && (
-              <div>
-                <label className="block text-sm font-medium mb-1">Attempts</label>
-                <input
-                  type="number"
-                  min={1}
-                  value={attempts}
-                  onChange={(e) => setAttempts(e.target.value)}
-                  className="w-full px-3 py-2 border rounded-md bg-surface-2 border-border-default"
-                />
-              </div>
-            )}
-          </div>
-
           <div className="px-6 py-4 border-t border-border-default flex justify-end gap-3">
             <button
               type="button"