CONV-091: Implement target format selection

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CONV-091 — Implement Target Format Selection

Implements the selectTargetFormat() handler the CONV-090 tests were written against (un-skips them).

Changes

• Add selectedTargetFormat and targetFormatError state.
• selectTargetFormat($targetFormat): looks up the converter via ConverterRegistry::find(source, target). On success sets selectedTargetFormat and moves to the settings step; on no match shows "This conversion is not supported yet." and stays on format; if the current file is gone, returns to upload.
• Add a settings step placeholder ("Settings for PNG to JPG … added in Phase 8"). No options schema rendered.
• Render targetFormatError on the format step.
• No ConversionJob is created (Phase 9).

Tests

• Un-skipped CONV-090 tests now pass: supported selection → settings placeholder; unsupported → format step + error.

composer test (189), composer lint, npm run build all pass.

🤖 Generated with Claude Code

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Summary by cubic

Implements target format selection in the dashboard (Linear CONV-091).
Looks up a converter via the registry, advances to a settings placeholder on success, shows "This conversion is not supported yet." on unsupported targets, returns to upload if the file is missing, and unskips CONV-090 tests which now pass.

^{Written for commit 8bde46f. Summary will update on new commits.}

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✨ Finishing Touches

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• Commit unit tests in branch feature/CONV-091-implement-target-format-selection

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