DataTableColumnToggle: custom label & initial column visibility (+ NativeSelectIcon chevron)

[pierry01]

1. DataTableColumnToggle — custom trigger label + initial column visibility

• New label: option (defaults to "Columns") so the trigger text can be localized/customized.
• Reads a :visible key per column, so a column can start hidden (checkbox unchecked) instead of every column defaulting to checked.
• Adds checked: utility classes to the checkbox for a clearer checked state.

render RubyUI::DataTableColumnToggle.new(
  label: "Colunas",
  columns: [
    {key: :email, label: "Email"},
    {key: :salary, label: "Salary", visible: false} # starts hidden
  ]
)

Before	After

Tests added in test/ruby_ui/data_table_column_toggle_test.rb for both the custom label and the initial-visibility behavior.

2. NativeSelectIcon — remove hardcoded chevron

Removes the default chevron path from the icon SVG.

Before	After

Testing

ruby -I. -Itest test/ruby_ui/data_table_column_toggle_test.rb   # 3 runs, 0 failures
ruby -I. -Itest test/ruby_ui/native_select_test.rb              # 1 run, 0 failures

[pierry01]

Splitting this into two single-concern PRs per @cirdes's review:

• feat(data_table): support custom label and initial column visibility in DataTableColumnToggle #466 — feat(data_table): custom label + initial column visibility for DataTableColumnToggle
• fix(native_select): correct viewBox casing so the default chevron renders #467 — refactor(native_select): drop hardcoded chevron from NativeSelectIcon

Closing this one in favor of those. 🙏