Rate: persist bounded visual layout preferences (#4433)

[d-sorgcodexagent]

Summary

• add a versioned, fail-closed presentation-preference contract for the canonical Club camera, React module-help disclosure, and bounded PyQt shell sidebar fraction
• preserve the existing primary-tab/order authority while keeping scientific results, imported mesh bytes, selections, playback phase, and export ownership session-only
• restore supported layouts without hiding primary visuals, including a two-row PyQt Club toolbar at 150% DPI
• add production browser reload evidence, real PyQt restart evidence, protected workflow authority, exact probe-only assertion policy, and SPEC 1.17.00 handoffs

Why

Issue #4433 requires durable visual workspace choices without allowing presentation state to become scientific authority. Prior camera/help/sidebar choices were lost between sessions, while corrupted storage needed to fail closed without breaking the application.

Validation

• full web suite: 130 files / 1,078 tests
• focused PyQt preference, camera, and navigation: 34/34
• post-rebase preference/render/workflow lane: 38/38
• Playwright persistence: 2/2 at 1440x900 and 390x844
• PyQt restart evidence: 2/2 at DPI 1.0 and 1.5; all-tab visibility 1/1
• TypeScript, ESLint, production Vite build, Ruff lint/format, Python 3.12 + MyPy 1.13, workflow/assertion/module-size governance, and diff checks green

Boundaries

Artifacts remain diagnostic rather than approved goldens or formal AT qualification. Per-tab inner layout, portable workspace/archive replay, cross-device synchronization, approved baselines, and manual assistive-technology validation remain open under #4433.