fix: update Granite 4.0 Tiny 7B repo config

- Changed repo_id from GGUF version to instruct version
- ibm-granite/granite-4.0-h-tiny-GGUF → ibm-granite/granite-4.0-h-tiny-instruct
- Changed filename from wildcard *Q4_K_M.gguf to specific granite-4.0-h-tiny-Q3_K_M.gguf
- Set as DEFAULT_EXTRACTION_MODEL for testing

This should fix the repository not found error.

app.py

@@ -851,8 +851,8 @@ EXTRACTION_MODELS = {
     },
     "granite4_tiny_q3": {
         "name": "Granite 4.0 Tiny 7B (128K Context)",
-        "repo_id": "ibm-granite/granite-4.0-h-tiny-GGUF",
-        "filename": "*Q4_K_M.gguf",
+        "repo_id": "ibm-granite/granite-4.0-h-tiny-instruct",
+        "filename": "granite-4.0-h-tiny-Q3_K_M.gguf",
         "max_context": 131072,
         "supports_reasoning": False,
         "supports_toggle": False,