CONV-107: Add settings field validation errors

[menvil]

CONV-107 — Add Settings Field Validation Errors

Field-level validation for settings options via the existing OptionsValidator.

• InvalidConverterOptionsException now carries the offending optionKey and exposes fieldErrors().
• New validateSettings() on the component maps field errors to options.{key} on the Livewire error bag.
• The dynamic form renders @error('options.{key}') next to each field (handled once in the partial wrapper, so every renderer benefits).
• No converter-specific validation in the component; schema is the source of truth.

Tests

• invalid option → options.quality error
• default options → no errors
• unknown option → options.bogus error
• validation creates no extra records

composer test (224), lint, build pass.

🤖 Generated with Claude Code

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Summary by cubic

Adds field-level validation for converter settings and shows inline errors in the dynamic options form. Addresses CONV-107 by mapping OptionsValidator errors to Livewire’s options.{key} and using the schema as the source of truth.

• New Features
  • InvalidConverterOptionsException now includes optionKey and fieldErrors().
  • Added validateSettings() in DashboardConverter to validate and add errors to options.{key}.
  • The dynamic form renders @error('options.{key}') messages under each field.
  • Tests cover invalid, unknown, and default options; no extra records are created.

^{Written for commit 866d63e. Summary will update on new commits.}

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