feat(datatables): add tooltip support and custom button helper

[sebastienheyd]

Summary

Add tooltip support and custom button helper to DataTable buttons with comprehensive improvements.

Features

• ✅ Add tooltip functionality with conditional rendering (no empty title="")
• ✅ Introduce custom() static helper method for simplified button creation
• ✅ Smart parameter ordering: icon before tooltip for better ergonomics
• ✅ Intelligent empty icon handling to prevent unnecessary HTML generation
• ✅ Comprehensive test coverage (8 tests, 20 assertions)
• ✅ Complete documentation with examples

API Usage

Method 1: Fluent API

Button::add('My button')
    ->route('users.show', $user->id)
    ->tooltip('View details')
    ->icon('eye')
    ->color('primary')
    ->make();

Method 2: Custom helper

Button::custom(
    'users.edit',           // route
    $user->id,              // args
    'pencil-alt',           // icon (3rd parameter)
    'Edit user profile',    // tooltip (4th parameter)
    'warning',              // color
    ['data-action' => 'edit'] // attributes
);

Test Results

✅ All 228 tests pass with 735 assertions

Changes

• src/Datatables/Button.php: Add tooltip property, custom() and tooltip() methods, conditional rendering
• tests/Datatables/ButtonTest.php: Complete test suite
• docs/docs/8.x/datatables/button.md: Updated documentation

Closes #104

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