fix: implement last visited page tracking for users in sessionStorage

[daniele-mng]

What

• Save each user’s last visited page in sessionStorage under gsa_last_visited_page_<username> and use it on login.
• Remove router location-state fallback to avoid redirecting user B to user A’s page. Clear the stored key after use.

Why

• Prevent cross-user redirects: store each user’s last page in sessionStorage (keyed by username) and remove the router location.state fallback, so users only get redirected to their own saved page (or homepage).

References

GEA-1580

Checklist

• Tests

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA c1f0c65.

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Scanned Files

None

[codecov]

Codecov Report

❌ Patch coverage is 87.87879% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.46%. Comparing base (377882d) to head (c1f0c65).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/web/utils/user-last-visited-page.ts	82.60%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5191   +/-   ##
=======================================
  Coverage   77.45%   77.46%           
=======================================
  Files        1179     1180    +1     
  Lines       30923    30946   +23     
  Branches     9294     9295    +1     
=======================================
+ Hits        23952    23971   +19     
- Misses       6237     6241    +4     
  Partials      734      734           

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