PoC: Refactor Argus Filter UI

[Simrayz]

Scope and purpose

Refactor the incident list filter UI based on user feedback requesting a more compact interface and collapsible filters:

• Replace the tabbed "Filter Incidents" / "Update Incidents" interface with a collapsible filterbox and a
  dynamic bulk actions bar
• Filterbox is hidden by default and toggled via a "Show/Hide filters" button
• Bulk actions only appear when rows are selected, reducing visual noise
• Extract toolbar into a new _incident_toolbar.html template and deprecate _incident_list_menubar.html for
  backwards compatibility

Screenshots

Contributor Checklist

Every pull request should have this checklist filled out, no matter how small it is.
More information about contributing to Argus can be found in the
Development docs.

• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation, including updates to the user manual if feature flow or UI is considerably changed
• Linted/formatted the code with ruff and djLint, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See our how-to
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done
• If this results in changes in the UI: Added screenshots of the before and after
• If this results in changes to the database model: Updated the ER diagram

[github-actions]

Test results

    6 files    834 suites   1m 45s ⏱️
  657 tests   656 ✅ 1 💤 0 ❌
3 942 runs  3 936 ✅ 6 💤 0 ❌

Results for commit 73496b8.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.46%. Comparing base (61b2109) to head (73496b8).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1693   +/-   ##
=======================================
  Coverage   80.46%   80.46%           
=======================================
  Files         135      135           
  Lines        6399     6399           
=======================================
  Hits         5149     5149           
  Misses       1250     1250           

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[johannaengland]

[hmpf]

When I update/delete a filter the dropdown is underneath the incident list again.

[hmpf]

I would prefer the opportunity to be able to keep the old way, that is: filters shown by default. This could be a user preference.

[hmpf]

Needs checking:

Possibly z-index shenanigans again.

Not blocking, but eeeh:

I would prefer the hiding of the filters to be opt-in (frankly I'd prefer hiding the "alter named filters" box).

[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

See analysis details on SonarQube Cloud