refactor(ui): redesign VersionTimeline UI

[balazs-szucs]

Description of Changes

I felt the old VersionTimeline was a bit too crowded/not very "good" looking so i had a crack at redesigning it. Mainly aimed for:

• less info
• less crowding
• more spacing

New

Old

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Checklist

General

• I have read the Contribution Guidelines
• I have read the Stirling-PDF Developer Guide (if applicable)
• I have read the How to add new languages to Stirling-PDF (if applicable)
• I have performed a self-review of my own code
• My changes generate no new warnings

Documentation

• I have updated relevant docs on Stirling-PDF's doc repo (if functionality has heavily changed)
• I have read the section Add New Translation Tags (for new translation tags only)

Translations (if applicable)

• I ran scripts/counter_translation.py

UI Changes (if applicable)

• Screenshots or videos demonstrating the UI changes are attached (e.g., as comments or direct attachments in the PR)

Testing (if applicable)

• I have run task check to verify linters, typechecks, and tests pass
• I have tested my changes locally. Refer to the Testing Guide for more details.

[Copilot]

Pull request overview

Redesigns the Files page “VersionTimeline” / “Version journey” UI to be less crowded, with a more card-like timeline presentation and reduced per-version detail.

Changes:

• Refactors VersionTimeline rows to a cleaner header/meta layout, removing the per-row expandable detail section.
• Updates the Version history modal title to include an icon + stronger title styling, and hides the timeline’s internal header inside the modal.
• Restyles the timeline in FilesPage.css (spacing, rail dots/lines, card container styling) and removes now-unused translation keys.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
frontend/editor/src/core/components/filesPage/VersionTimeline.tsx	Reworks timeline row rendering and actions UI; simplifies content shown per version.
frontend/editor/src/core/components/filesPage/VersionHistoryModal.tsx	Enhances modal title presentation and passes hideHeader to the timeline.
frontend/editor/src/core/components/filesPage/FilesPage.css	Adjusts timeline styling for the redesigned layout; introduces some selectors that are now unused.
frontend/editor/public/locales/en-US/translation.toml	Removes translation keys that are no longer referenced by the UI.

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