✨(frontend) expose the full last-update date

[fch-aa]

Fixes #1215

Purpose

Documents currently show their last update as a relative value, which does not
provide the exact timestamp when users need it. This PR addresses #1215 by
exposing the localized full date on hover and keyboard focus while preserving
the existing compact relative-date display.

The copy action is intentionally omitted following the maintainer discussion
on the issue.

Proposal

• Reuse the existing useDate().formatDate localization utility.
• Display the full date with the existing Cunningham Tooltip component.
• Use focusable semantic <time> markup with a machine-readable value.
• Cover the relative value, localized full date, hover, and keyboard focus.

Local validation completed:

• yarn test: 55 collaboration-server tests and 306 Impress tests passed.
• yarn lint: TypeScript and all frontend ESLint workspaces passed.
• yarn app:build: Prettier, Stylelint, TypeScript, and production build passed.
• gitlint --commits HEAD^..HEAD: passed.

Video

2026-08-14.16-33-49.mp4

External contributions

General requirements

• I have read and followed the contributing guidelines
• I have read and agreed to the Code of Conduct
• I have added corresponding tests for new features or bug fixes (if applicable)

CI requirements

• I made sure that all existing tests are passing
• I have signed off my commits with git commit --signoff (DCO compliance)
• I have signed my commits with my SSH or GPG key (git commit -S)
• My commit messages follow the required format: <gitmoji>(type) title description
• I have added a changelog entry under ## [Unreleased] section (if noticeable change)

AI requirements

• I used AI assistance to produce part or all of this contribution
• I have read, reviewed, understood and can explain the code I am submitting
• I can jump in a call or a chat to explain my work to a maintainer

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: a02e3f61-3a84-4ce0-b1ac-218916759b4b

📥 Commits

Reviewing files that changed from the base of the PR and between fb984ab and 127a427.

📒 Files selected for processing (3)

• CHANGELOG.md
• src/frontend/apps/impress/src/features/docs/doc-header/__tests__/DocHeaderInfo.spec.tsx
• src/frontend/apps/impress/src/features/docs/doc-header/components/DocHeaderInfo.tsx

---

Walkthrough

DocHeaderInfo now shows the relative update date inside a tooltip with the full formatted date for active documents. The timestamp is focusable and has an accessible label. Deleted documents keep their remaining-days display. Tests cover English and French formatting, keyboard focus, hover behavior, and deterministic dates. The changelog records the frontend change.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 127a4

This localized change adds an accessible full last-update date while preserving the existing relative display, with no actionable merge-blocking risk remaining after normal checks and review.

Suggested reviewers: antolc

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes exposing the full last-update date, which is the primary change in the pull request.
Description check	✅ Passed	The description directly explains the full-date tooltip, keyboard accessibility, implementation choices, tests, and validation results.
Linked Issues check	✅ Passed	The changes satisfy issue #1215 by exposing the precise last-edit date on hover; the suggested copy action is optional and intentionally omitted.
Out of Scope Changes check	✅ Passed	The component change, focused tests, and changelog entry are directly related to the full last-update date objective.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}