refactor(auth): decouple NIP-07 logic and optimize list fetching (agent)

- Moved NIP-07 extension detection and permission logic from `NostrClient` to `nip07` provider.
- Removed redundant `login` method from `NostrClient`.
- Increased concurrency and added timeouts to `fetchListIncrementally` to prevent hanging on slow relays.
- Updated `UserBlocks` to force full fetch on cache miss, fixing "empty list" issues.
- Updated unit tests for login permissions and hashtag preferences to reflect architectural changes.

Co-authored-by: PR0M3TH3AN <[email protected]>

js/userBlocks.js

@@ -729,6 +729,8 @@ class UserBlockListManager {
     emitStatus({ status: "loading", relays: Array.from(nostrClient.relays || []) });
 
     const localBlocks = this._loadLocal(normalized);
+    const hasLocalData = !!localBlocks;
+
     if (localBlocks) {
       this.blockedPubkeys = localBlocks;
       this.loaded = true;
@@ -1067,18 +1069,24 @@ class UserBlockListManager {
         }
       };
 
+      // If we don't have local data, we must ignore the sync metadata and force a full fetch (since: 0).
+      // Otherwise, we might miss data if the metadata store says we are up-to-date but the actual list is missing.
+      const fetchSince = hasLocalData ? undefined : 0;
+
       // Concurrent incremental fetch for both kinds
       const [muteEvents, blockEvents] = await Promise.all([
         nostrClient.fetchListIncrementally({
           kind: 10000,
           pubkey: normalized,
           relayUrls: relays,
+          since: fetchSince,
         }),
         nostrClient.fetchListIncrementally({
           kind: 30002,
           pubkey: normalized,
           dTag: BLOCK_LIST_IDENTIFIER,
           relayUrls: relays,
+          since: fetchSince,
         }),
       ]);