fix(fonts): log the BDF native-size read failure instead of swallowing it

The bdf-native-size lookup in get_fonts_catalog() caught any exception
and silently discarded it. Every other guarded read added in this PR
(the manifest parse in _declared_widget_script, the SchemaManager
fallback in _load_plugin_config_partial) logs before falling through
to the same degraded behavior. This one didn't, which is the shape a
silent-exception-swallow lint rule flags. Behavior is unchanged --
native_size still comes back None -- but a corrupt or unreadable BDF
file now leaves a trace.

Verified: font-related tests (140) and the full suite still pass,
with only the 2 pre-existing Europe/Kiev/Asia/Calcutta tzdata-alias
failures already present on origin/main.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

web_interface/blueprints/api_v3/fonts.py

@@ -92,7 +92,9 @@ def get_fonts_catalog():
                         try:
                             from src.element_style import _read_bdf_native_size
                             native_size = _read_bdf_native_size(str(filepath))
-                        except Exception:
+                        except Exception as e:
+                            logger.debug("Could not read native size for BDF font %s: %s",
+                                         filepath, e)
                             native_size = None
 
                     catalog[catalog_key] = {