Improve exception handling to avoid broad exception catching

[Claude]

Multiple cogs used overly broad except Exception handlers that swallowed errors and made debugging difficult. Some handlers silently suppressed all exceptions with bare pass statements, providing no indication when failures occurred.

Changes

empty_voices/api.py

• Config cleanup (L74-77): Split broad exception into KeyError, ValueError for expected config errors, with log.exception() for unexpected cases
• Category refresh (L127-136): Added discord.HTTPException handler with exc_info=True for HTTP-specific errors
• Channel creation (L208-220): Separated discord.HTTPException from generic exceptions, added detailed error messages
• Channel operations (L78-81, L239-241): Changed log.error() to log.exception() for full stack traces on unexpected errors

hat/hat.py

• Message cleanup (L112-119, L126-133): Replaced bare except Exception: pass with specific discord.HTTPException handler and logging
• Avatar fetching (L212-217): Added discord.HTTPException handler and proper error logging instead of silent return None

nw_server_status/server_status.py

• Background task (L46-51): Split broad handler into httpx.HTTPError, httpx.TimeoutException for network errors
• Data fetching (L69-76): Added KeyError, ValueError for parsing errors, separated from network errors
• HTTP retry logic (L267-274): Replaced internal exception paths (httpx._exceptions) with public API, added per-attempt logging

Pattern

Before:

except Exception as e:
    log.error(f"Error: {e}")  # No stack trace, catches everything

After:

except discord.HTTPException as e:
    log.error(f"HTTP error: {e}", exc_info=True)  # Stack trace for known errors
except Exception as e:
    log.exception(f"Unexpected error: {e}")  # Full traceback for unknowns

All changes maintain backward compatibility while significantly improving error visibility and debuggability.