fix: narrow empty except blocks and add explanatory comments

Author: mnriem

src/specify_cli/__init__.py

@@ -1606,7 +1606,8 @@ def init(
                             # Clean up downloaded ZIP to avoid cache accumulation
                             try:
                                 zip_path.unlink(missing_ok=True)
-                            except Exception:
+                            except OSError:
+                                # Best-effort cleanup; failure to delete is non-fatal
                                 pass
                         except PresetError:
                             console.print(f"[yellow]Warning:[/yellow] Preset '{preset}' not found in catalog. Skipping.")

src/specify_cli/presets.py

@@ -1145,6 +1145,7 @@ def fetch_catalog(self, force_refresh: bool = False) -> Dict[str, Any]:
                 if metadata.get("catalog_url") == catalog_url:
                     return json.loads(self.cache_file.read_text())
             except (json.JSONDecodeError, OSError):
+                # Cache is corrupt or unreadable; fall through to network fetch
                 pass
 
         try: