feat: apply web of trust filter to thread replies

The WoT filter was already silently dropping events at EventRepository
ingestion and in NotificationRepository, but thread replies bypassed
both paths — ThreadViewModel keeps its own threadEvents map seeded via
cacheEvent() and getCachedThreadEvents(), neither of which checks WoT.

Apply isWotFiltered in rebuildTree() alongside the existing block /
mute / spam filters. The root note is always shown (user explicitly
navigated to it); replies from authors outside the qualified network
are silently dropped, matching how WoT behaves in the feed and
notifications.

app/src/main/kotlin/com/wisp/app/repo/EventRepository.kt

@@ -313,7 +313,7 @@ class EventRepository(val profileRepo: ProfileRepository? = null, val muteRepo:
 
     private val WOT_EXEMPT_KINDS = intArrayOf(0, 3, 4, 10002, 10050, 1059, 13, 14)
 
-    private fun isWotFiltered(pubkey: String, kind: Int): Boolean {
+    fun isWotFiltered(pubkey: String, kind: Int): Boolean {
         if (safetyPrefs?.wotFilterEnabled?.value != true) return false
         val netRepo = extendedNetworkRepo ?: return false
         if (!netRepo.isNetworkReady()) return false

app/src/main/kotlin/com/wisp/app/viewmodel/ThreadViewModel.kt

@@ -434,6 +434,7 @@ class ThreadViewModel : ViewModel() {
             if (deletedRepo?.isDeleted(event.id) == true) continue
             if (muteRepo?.isBlocked(event.pubkey) == true) continue
             if (Nip10.isStandaloneQuote(event)) continue
+            if (eventRepoRef?.isWotFiltered(event.pubkey, event.kind) == true) continue
 
             if (spamEnabled && spamClassifier != null &&
                 event.pubkey != currentUserPubkey &&