fix(web): restore the grouped, alphabetised Help glossary (#657)

[mforce]

PR #901 (4ee8b03) carried a stale helpGlossary.ts and reverted the grouped glossary from #657 (af4fe11). This restores the seven groups, translated jump navigation, active-language sorting, search folding, and sticky group headings on the redesigned Help page.

The approved #901 interactions remain unchanged: glossary entries still use the <details> accordion, and deep links still open and scroll to the target disclosure.

Tests:

• cd web && npm run typecheck
• cd web && npm test -- --run (3,251 passed)
• Four mutation checks covering unknown groups, empty groups, missing group labels in each catalog, and removal of active-language sorting
• Real-browser before/after captures at 1280×800 and 390×844, light and dark, including an active search

Closes #833

[coderabbitai]

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Run ID: c162c8a0-b7f5-48f5-bd63-b6bec035c562

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[mforce]

Browser evidence from isolated cw657 stacks rebuilt from origin/main and commit 520f471.

The normal frames show the flat baseline versus seven grouped headings and jump links. The search frames use fifo; the restored page hides the jump navigation and empty groups, leaving only the matching Eggs/stock and Supplies groups. Both Playwright runs passed, with no unexpected page or console errors on the branch build.