CONV-109: Preserve settings state during navigation

[menvil]

CONV-109 — Preserve Settings State During Navigation

Component-local cache so settings survive settings → format → settings for the same target.

• New optionsByTarget map; rememberCurrentOptions() snapshots $options under the current target when leaving for the format step.
• selectTargetFormat restores cached options for a returning target, otherwise re-initializes defaults — so switching targets still resets incompatible options.
• Cache cleared on file remove/replace/back-to-upload. No DB persistence, no presets.

Tests

• same target restores edited options.quality
• different target resets to its defaults (no Background color leak)
• file preserved navigating settings → format

composer test (230), lint, build pass.

🤖 Generated with Claude Code

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Summary by cubic

Preserves settings when navigating between Settings and Format for the same target format, so user edits aren’t lost. Implements CONV-109.

• New Features
  • Adds a per-target options cache (optionsByTarget) scoped to the component; no persistence.
  • Snapshots options on step changes and restores them when returning to the same target; re-initializes defaults when switching targets to avoid leaks.
  • Clears cached options when the file is removed/replaced or on back-to-upload.

^{Written for commit c774f0e. Summary will update on new commits.}

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