feat: Claude and Codex parity for v2.4.0 - #116

Summary

Bring Codex out of Beta with the same navigation, chart drill-down, keyboard, accessibility, and visual interaction patterns as Claude, while preserving each provider's distinct token, price, cache, and quota semantics. Consolidate local sharing into one preview-first workspace, improve large-history and live-scroll behavior, and complete documentation for all eight UI languages. This branch is based on main after #114 and #115, so their fixes and contributor attribution remain upstream rather than being duplicated here.

Linked issues

Relates to #99. The append and memory regressions are covered, but the reported Windows CPU behavior has not been independently reproduced or declared fixed.

Type of change

• Bug fix (non-breaking) → fix (patch)
• New feature (non-breaking) → feature (minor)
• Breaking change (existing behaviour differs afterwards) → breaking (major)
• Documentation / CI / chore → docs / ci / chore (patch)

How was this tested?

• npm run test:release: 1,108 Node tests passed, one intentionally skipped; 182 Chromium UI tests passed, including both upstream date/index changes and the new provider-parity, sharing, narrow-screen, and accessibility regressions.
• A post-integration 2.4.0 VSIX was built with pinned @vscode/vsce 4.0.0 and passed the repository's archive/payload verification (122 files). This exact combined artifact still needs maintainer installed-extension acceptance.
• Synthetic large-history diagnostics cover unchanged refreshes, concurrent appends, new files, and bounded memory. The 20-update browser scroll regression limits provider-panel swaps to two; these measurements do not substitute for a real Windows performance check.
• Screenshots from deterministic synthetic data: Codex monthly view, Compare sharing, Claude sharing, and narrow German sharing.

Checklist

• npm run compile is clean
• User-facing strings go through I18n with all eight UI locales filled
• Behaviour/documentation changes update all nine README files together (main page and eight locale editions)
• CHANGELOG.md updated (user-visible changes)
• README.md updated if behaviour/settings changed
• New settings default to existing behaviour (opt-in) — deliberate exception: Codex's default status-bar metric becomes today's processed tokens; sharing remains on by default and can be disabled.
• No new runtime dependencies

This is a reviewable candidate, not a published release. Remote CI and maintainer review remain gates before merging or release.

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