CONV-089: Add unsupported source format empty state

[menvil]

CONV-089 — Add Unsupported Source Format Empty State

Gracefully handles source formats that have no registered target converters (e.g. a PDF or WEBP file, which have no converters as a source in the MVP registry).

Changes

• Format step shows a "No conversion targets available" empty state with guidance and an "Upload another file" action when targetFormatCards is empty, instead of an empty/broken cards grid.

Tests

• A PDF file (no source converters) shows the empty state and no Convert PDF to heading.

composer test (187), composer lint, npm run build all pass.

🤖 Generated with Claude Code

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Summary by cubic

Adds an empty state to the Format step when a source file has no available conversion targets, per CONV-089. Prevents a blank grid and guides users to upload another file.

• New Features
  • Show a "No conversion targets available" message with guidance and an "Upload another file" button when targetFormatCards is empty.
  • Hide the "Convert {EXT} to" heading for unsupported sources.

^{Written for commit 2c4a12b. 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-089-add-unsupported-source-format-empty-state

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