Add focused datagrid test coverage

[ohmyfelix]

Summary

Adds focused tests for previously thinly covered datagrid helpers and action configuration paths, plus small PHPStan compatibility fixes for the current dependency set used in CI.

Motivation

Improve regression coverage around pure utility behavior and user-facing action APIs without relying on brittle database or browser setup, while keeping CI green with freshly resolved dependencies.

Changes

• Add tests for array and date-time helper edge cases.
• Add MultiAction and group-action unit coverage.
• Extend action and status confirmation coverage.
• Extend SearchParamsBuilder range and empty-query edge coverage.
• Tighten PHPStan-compatible source types around form/control handling.
• Rebase onto current master and keep the branch to two logical commits.

Testing

• vendor/bin/tester -s -p php --colors 1 -C tests/Cases

---

|_ / )( / / __)| _ )
|| _ /) || ___ ||\ v2.6.0

�[?25lPHP 8.5.3 (cli) | php | 8 threads

...............................s.

-- Skipped: DataSources/NextrasDataSourceTest.phpt dataprovider=mysql|/home/coder/ohmyfelix/source/contributte/datagrid/tests/Cases/DataSources/nextrasDatasource.ini
MySQL is not running

�[1m�[37m�[42mOK (33 tests, 1 skipped, 0.6 seconds)�[0m
�[?25h

• vendor/bin/phpcs --standard=ruleset.xml --extensions=php,phpt --tab-width=4 --ignore=tests/tmp --colors -nsp src tests
  ............................................................ 60 / 141 (43%)
  ............................................................ 120 / 141 (85%)
  ..................... 141 / 141 (100%)

Time: 3.82 secs; Memory: 30MB

• vendor/bin/phpstan analyse -c phpstan.neon --memory-limit=512M

[OK] No errors

• Latest CI passes

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.77%. Comparing base (5758cba) to head (066597a).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/GroupAction/GroupActionCollection.php	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1286      +/-   ##
==========================================
+ Coverage   47.57%   48.77%   +1.19%     
==========================================
  Files          53       61       +8     
  Lines        2726     2901     +175     
==========================================
+ Hits         1297     1415     +118     
- Misses       1429     1486      +57     

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