fix(knowledge): use .count from estimateTokenCount return value

estimateTokenCount returns a TokenEstimate object, not a number — access
.count so the integer token count is stored instead of an object.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/lib/knowledge/documents/service.ts

@@ -545,7 +545,7 @@ export async function processDocumentAsync(
           chunkHash: sha256Hex(chunk.text),
           content: chunk.text,
           contentLength: chunk.text.length,
-          tokenCount: estimateTokenCount(chunk.text, tokenizerProvider),
+          tokenCount: estimateTokenCount(chunk.text, tokenizerProvider).count,
           embedding: embeddings[chunkIndex] || null,
           embeddingModel: kbEmbeddingModel,
           startOffset: chunk.metadata.startIndex,