v1.4.0: Prevent HTTP 500 errors and refactor to HA integration best practices

[Copilot]

Config flow crashes with HTTP 500 when encountering empty entity lists, invalid domains, or schema construction failures during configuration. Additionally, code structure did not follow Home Assistant integration conventions used by professional integrations like Battery Devices Monitor.

Error Handling

Wrapped all flow steps in defensive error boundaries:

• Try-except blocks around user input processing and schema construction
• Fallback schemas when primary construction fails
• Early return on empty entity lists instead of invalid dropdown construction
• Structured logging throughout flow lifecycle

Example:

# Before: crashes on empty available_entities
select_options = [SelectOptionDict(value=e, label=e) for e in available_entities]

# After: safe fallback
try:
    if not available_entities:
        return await self.async_step_finish()
    select_options = [SelectOptionDict(value=e, label=e) for e in available_entities]
    data_schema = vol.Schema({...})
except Exception as err:
    _LOGGER.error("Error building schema: %s", err, exc_info=True)
    data_schema = vol.Schema({
        vol.Required(ATTR_TRIGGER_ENTITY): EntitySelector(EntitySelectorConfig())
    })

Structure Refactoring

Aligned with HA best practices:

• Renamed HADailyCounterConfigFlow → FlowHandler
• Renamed HADailyCounterOptionsFlow → OptionsFlowHandler
• Consolidated both classes into config_flow.py (removed separate options_flow.py)
• Updated type hints to modern Python syntax (dict[str, Any] vs Dict[str, Any])

Files changed:

• config_flow.py: +402/-116 lines (now 540 lines, contains both flow handlers)
• options_flow.py: deleted (217 lines)
• manifest.json: version → 1.4.0
• CHANGELOG.md: release notes

Structure now matches Battery Devices Monitor and other professional HA integrations where both flow handlers reside in single file.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.