Foro: edición/borrado de posts, moderación de temas y búsqueda

Portado desde forum/db.py + forum/permissions.py de Django:
- lib/forum-perm.ts: forumIsModerator (gmlevel >= FORUM_MOD_GMLEVEL) y
  canEditPost (autor o moderador).
- Edición y borrado lógico de posts (autor o mod), respetando tema bloqueado,
  con validación de longitud mínima (plainLength).
- Moderación de temas (solo mod): bloquear/desbloquear, fijar/no fijar, borrar.
- Búsqueda de temas por título/contenido (searchTopics/countSearchTopics)
  con página /forum/search y buscador en el índice.
- API: PATCH/DELETE /api/forum/post, POST /api/forum/moderate (401/403 correctos).
- UI: PostActions, TopicModBar, ForumSearchBox; marca "editado" y "[Fijado]".
- i18n: 22 claves nuevas en es/en.

Verificado: build OK, /forum y /forum/search 200, APIs 401 sin sesión.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-next/components/PostActions.tsx

@@ -0,0 +1,93 @@
+'use client'
+
+import { useState } from 'react'
+import { useTranslations } from 'next-intl'
+import { useRouter } from '@/i18n/navigation'
+
+export function PostActions({ postId, initialText }: { postId: number; initialText: string }) {
+  const t = useTranslations('Forum')
+  const router = useRouter()
+  const [editing, setEditing] = useState(false)
+  const [text, setText] = useState(initialText)
+  const [busy, setBusy] = useState(false)
+  const [error, setError] = useState<string | null>(null)
+
+  async function save() {
+    if (busy || !text.trim()) return
+    setBusy(true)
+    setError(null)
+    try {
+      const res = await fetch('/api/forum/post', {
+        method: 'PATCH',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'same-origin',
+        body: JSON.stringify({ postId, text }),
+      })
+      const data: { success?: boolean; error?: string } = await res.json()
+      if (data.success) {
+        setEditing(false)
+        router.refresh()
+      } else {
+        setError(t(data.error === 'tooShort' ? 'tooShort' : data.error === 'topicLocked' ? 'topicLocked' : 'genericError'))
+      }
+    } catch {
+      setError(t('genericError'))
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  async function remove() {
+    if (busy || !confirm(t('confirmDeletePost'))) return
+    setBusy(true)
+    setError(null)
+    try {
+      const res = await fetch('/api/forum/post', {
+        method: 'DELETE',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'same-origin',
+        body: JSON.stringify({ postId }),
+      })
+      const data: { success?: boolean } = await res.json()
+      if (data.success) router.refresh()
+      else setError(t('genericError'))
+    } catch {
+      setError(t('genericError'))
+    } finally {
+      setBusy(false)
+    }
+  }
+
+  if (editing) {
+    return (
+      <div className="mt-3 space-y-2">
+        <textarea value={text} onChange={(e) => setText(e.target.value)} rows={4} className="nw-input" />
+        <div className="flex gap-2">
+          <button type="button" onClick={save} disabled={busy} className="nw-btn text-sm disabled:opacity-60">
+            {busy ? t('sending') : t('save')}
+          </button>
+          <button
+            type="button"
+            onClick={() => { setEditing(false); setText(initialText); setError(null) }}
+            className="nw-btn-ghost text-sm"
+          >
+            {t('cancel')}
+          </button>
+        </div>
+        {error && <p className="text-sm text-red-400">{error}</p>}
+      </div>
+    )
+  }
+
+  return (
+    <div className="mt-2 flex items-center gap-3 text-xs">
+      <button type="button" onClick={() => setEditing(true)} className="text-nw-muted hover:text-nw-gold-light">
+        {t('edit')}
+      </button>
+      <button type="button" onClick={remove} disabled={busy} className="text-nw-muted hover:text-red-400 disabled:opacity-60">
+        {t('delete')}
+      </button>
+      {error && <span className="text-red-400">{error}</span>}
+    </div>
+  )
+}