Collapsible gamerules

[1.0.24+26.2]

• Interactive Integer Sliders (IntegerRuleEntryMixin): Replaced vanilla text edit boxes with interactive IntegerSliderWidget for bounded integer game rules (random_tick_speed, respawn_radius, players_sleeping_percentage, max_entity_cramming, etc.).
• Graceful Unbounded Fallback: Automatically preserves vanilla EditBox for unbounded rules (max_command_sequence_length, max_command_forks, etc.), ensuring full player flexibility for arbitrary numeric entry.
• Discrete Step Snapping & Value Sync: Snaps slider position and handle cleanly to configured step intervals (e.g. 5% increments for players_sleeping_percentage), seamlessly updating vanilla game rules via input.setValue().
• Bounded Integer Slider Metadata & Helper Registry: Created GameRuleSliderHelper defining safe numerical bounds, step intervals, and unit formatters for standard vanilla integer rules with comprehensive automated JUnit 5 test coverage.
• Modern Boolean Toggle Switch Hook (BooleanRuleEntryMixin): Wired BooleanToggleWidget into BooleanRuleEntry, replacing vanilla checkboxes with the modern emerald/ruby toggle switch across all boolean game rules with precision right-alignment (getContentRight() - 45).
• Superclass Shadow Mixin Fix: Eliminated superclass @Shadow calls on extractLabel and children, permanently fixing the InvalidMixinException that caused the screen to freeze on "Retrieving game rules... o O o".