Add non-evolution form change support (Rotom, Oricorio, etc.)

Add a "Change Form" button in StatusChangeModal for Pokemon with
alternate forms sharing the same national_dex number. Mirrors the
existing evolution UI pattern, reusing currentPokemonId to track
the active form.

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

frontend/src/api/encounters.ts

@@ -4,6 +4,7 @@ import type {
   CreateEncounterInput,
   UpdateEncounterInput,
   Evolution,
+  Pokemon,
 } from '../types/game'
 
 export function createEncounter(
@@ -28,3 +29,7 @@ export function fetchEvolutions(pokemonId: number, region?: string): Promise<Evo
   const params = region ? `?region=${encodeURIComponent(region)}` : ''
   return api.get(`/pokemon/${pokemonId}/evolutions${params}`)
 }
+
+export function fetchForms(pokemonId: number): Promise<Pokemon[]> {
+  return api.get(`/pokemon/${pokemonId}/forms`)
+}

frontend/src/components/StatusChangeModal.tsx

@@ -1,6 +1,6 @@
 import { useState } from 'react'
 import type { EncounterDetail, UpdateEncounterInput } from '../types'
-import { useEvolutions } from '../hooks/useEncounters'
+import { useEvolutions, useForms } from '../hooks/useEncounters'
 import { TypeBadge } from './TypeBadge'
 
 interface StatusChangeModalProps {
@@ -49,6 +49,7 @@ export function StatusChangeModal({
   const displayPokemon = currentPokemon ?? pokemon
   const [showConfirm, setShowConfirm] = useState(false)
   const [showEvolve, setShowEvolve] = useState(false)
+  const [showFormChange, setShowFormChange] = useState(false)
   const [deathLevel, setDeathLevel] = useState('')
   const [cause, setCause] = useState('')
 
@@ -57,6 +58,7 @@ export function StatusChangeModal({
     showEvolve ? activePokemonId : null,
     region,
   )
+  const { data: forms } = useForms(isDead ? null : activePokemonId)
 
   const handleConfirmDeath = () => {
     onUpdate({
@@ -170,7 +172,7 @@ export function StatusChangeModal({
           )}
 
           {/* Alive pokemon: actions */}
-          {!isDead && !showConfirm && !showEvolve && (
+          {!isDead && !showConfirm && !showEvolve && !showFormChange && (
             <div className="flex gap-3">
               <button
                 type="button"
@@ -179,6 +181,15 @@ export function StatusChangeModal({
               >
                 Evolve
               </button>
+              {forms && forms.length > 0 && (
+                <button
+                  type="button"
+                  onClick={() => setShowFormChange(true)}
+                  className="flex-1 px-4 py-2 bg-purple-600 text-white rounded-lg font-medium hover:bg-purple-700 transition-colors"
+                >
+                  Change Form
+                </button>
+              )}
               <button
                 type="button"
                 onClick={() => setShowConfirm(true)}
@@ -242,6 +253,55 @@ export function StatusChangeModal({
             </div>
           )}
 
+          {/* Form change selection */}
+          {!isDead && showFormChange && (
+            <div className="space-y-3">
+              <div className="flex items-center justify-between">
+                <h3 className="text-sm font-medium text-gray-700 dark:text-gray-300">
+                  Change form to:
+                </h3>
+                <button
+                  type="button"
+                  onClick={() => setShowFormChange(false)}
+                  className="text-xs text-gray-500 hover:text-gray-700 dark:hover:text-gray-300"
+                >
+                  Back
+                </button>
+              </div>
+              {forms && forms.length > 0 && (
+                <div className="space-y-2">
+                  {forms.map((form) => (
+                    <button
+                      key={form.id}
+                      type="button"
+                      disabled={isPending}
+                      onClick={() => handleEvolve(form.id)}
+                      className="w-full flex items-center gap-3 p-3 rounded-lg border border-gray-200 dark:border-gray-600 hover:bg-purple-50 dark:hover:bg-purple-900/20 hover:border-purple-300 dark:hover:border-purple-600 transition-colors disabled:opacity-50"
+                    >
+                      {form.spriteUrl ? (
+                        <img src={form.spriteUrl} alt={form.name} className="w-10 h-10" />
+                      ) : (
+                        <div className="w-10 h-10 rounded-full bg-gray-300 dark:bg-gray-600 flex items-center justify-center text-sm font-bold text-gray-600 dark:text-gray-300">
+                          {form.name[0].toUpperCase()}
+                        </div>
+                      )}
+                      <div className="text-left">
+                        <div className="font-medium text-gray-900 dark:text-gray-100 text-sm">
+                          {form.name}
+                        </div>
+                        <div className="flex gap-1">
+                          {form.types.map((type) => (
+                            <TypeBadge key={type} type={type} />
+                          ))}
+                        </div>
+                      </div>
+                    </button>
+                  ))}
+                </div>
+              )}
+            </div>
+          )}
+
           {/* Confirmation form */}
           {!isDead && showConfirm && (
             <div className="space-y-3">
@@ -312,7 +372,7 @@ export function StatusChangeModal({
         </div>
 
         {/* Footer for dead/no-confirm/no-evolve views */}
-        {(isDead || (!isDead && !showConfirm && !showEvolve)) && (
+        {(isDead || (!isDead && !showConfirm && !showEvolve && !showFormChange)) && (
           <div className="px-6 py-4 border-t border-gray-200 dark:border-gray-700 flex justify-end">
             <button
               type="button"

frontend/src/hooks/useEncounters.ts

@@ -4,6 +4,7 @@ import {
   updateEncounter,
   deleteEncounter,
   fetchEvolutions,
+  fetchForms,
 } from '../api/encounters'
 import type { CreateEncounterInput, UpdateEncounterInput } from '../types/game'
 
@@ -50,3 +51,11 @@ export function useEvolutions(pokemonId: number | null, region?: string) {
     enabled: pokemonId !== null,
   })
 }
+
+export function useForms(pokemonId: number | null) {
+  return useQuery({
+    queryKey: ['forms', pokemonId],
+    queryFn: () => fetchForms(pokemonId!),
+    enabled: pokemonId !== null,
+  })
+}