Fix bookmark last visit time on Chrome

[msmolens]

The chrome.history.getVisits API behaves differently on different browsers: Firefox sorts the visits in reverse chronological order and Chrome sorts the visits in chronological order.

Update the HistoryManager to handle both cases. This fixes a bug on Chrome where a previously visited bookmark might not display in a larger font even if it's been visited recently.

See:

• https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/history/getVisits
• https://bugzilla.mozilla.org/show_bug.cgi?id=1389588

[Copilot]

Pull Request Overview

This PR fixes a browser compatibility issue where bookmark last visit times were incorrectly calculated on Chrome due to different sorting behaviors between Chrome and Firefox in the chrome.history.getVisits API.

• Adds a new getMostRecentItem function that handles both Chrome's chronological and Firefox's reverse chronological ordering
• Updates the HistoryManager to use this function instead of assuming the first item is the most recent
• Enhances test factories and test coverage to verify both browser ordering conventions

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/treetop/HistoryManager.ts	Implements the core fix with getMostRecentItem function and updates all visit time calculations
test/utils/factories.ts	Adds createVisitItems factory to generate test data with different browser ordering conventions
src/treetop/HistoryManager.test.ts	Expands test coverage to verify both Chrome and Firefox ordering behaviors
CHANGELOG.md	Documents the bug fix in the changelog

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