CONV-108: Validate settings before convert step

[menvil]

CONV-108 — Validate Settings Before Convert Step

A Continue action validates settings and advances to a placeholder convert step only when options are valid.

• New continueFromSettings(): guards file/target, runs validateSettings(), advances to convert on success or stays on settings with field errors.
• Settings step gains a Continue button; new convert placeholder block ("available in Phase 9").
• Stepper highlight now maps every step (File/Format/Settings/Convert).
• No ConversionJob / queue / billing.

Tests

• valid settings → convert step, no errors
• invalid settings → stay on settings with options.quality error
• continuing creates no extra records

composer test (227), lint, build pass.

🤖 Generated with Claude Code

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Summary by cubic

Validates settings before advancing from Settings to Convert, and adds a Convert placeholder with proper stepper highlighting. Fulfills Linear CONV-108; no conversion jobs or records are created yet.

• New Features
  • Validate settings on Continue from Settings; move to Convert on success, otherwise stay and show field errors. No new records or jobs are created.
  • UI updates: Continue button on Settings, stepper highlights File/Format/Settings/Convert correctly, and a Convert placeholder with a Back action.

^{Written for commit 634df2c. Summary will update on new commits.}

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