BugFix: Fix openTabs limiting logic to always keep only the last 10 items

[hopleus]

Previously, the logic for limiting openTabs relied on reverse() + splice(10, 1000) + reverse().
This worked only if the total number of open tabs never exceeded 1010.
If a user accumulated more than 1000 tabs (e.g. 1140 over a year of usage), the result would incorrectly keep 140 tabs instead of just the last 10.

This PR replaces that logic with a simpler and correct approach:

openTabs = openTabs.slice(-10);

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[hopleus]

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