CONV-094: Add target format step loading and error states

[menvil]

CONV-094 — Add Target Format Step Loading And Error States

Adds tidy loading and error UX to the target-format step.

Changes

• Unsupported-conversion error now renders as a styled alert (targetFormatError).
• Added a wire:loading spinner targeting selectTargetFormat ("Loading converter settings…").
• Target cards are disabled (wire:loading.attr="disabled" + disabled: styles) while a selection is processing.

Tests

• Invalid target selection shows the full "This conversion is not supported yet." message.
• Format step renders a loading indicator targeting selectTargetFormat.

composer test (198), composer lint, npm run build all pass.

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-094 by adding clear loading and error states to the target-format step. Users now see a spinner while settings load, cards are disabled during processing, and unsupported conversions show a styled alert.

• New Features
  • Styled alert for unsupported conversions via targetFormatError.
  • Loading indicator scoped to selectTargetFormat.
  • Disable target cards while selectTargetFormat is processing.

^{Written for commit ae1eb59. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-094-add-target-format-step-loading-and-error-states

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