RGB Color Blocks

## Manual RGB Lighting Update

- Added server-synchronized **AUTO** and **MANUAL** RGB lighting modes.
- Added `/rgb auto` and `/rgb manual` commands.
- Added `/rgb bake` for applying recorded RGB lighting changes in MANUAL mode.
- Added `/rgb setbake <4-256>` for selecting a player-centered Bake radius.
- Added `/rgb setbake all` for processing all recorded dirty positions in the current dimension.
- Added `/rgb get` and `/rgb bake get` for displaying the current mode, Bake scope, and world ID.
- Added the **RGB Light Switch** item for toggling AUTO and MANUAL modes.
- Added the **RGB Light Baker** item for executing the currently configured Bake.
- Added a new **RGB Tools** creative tab containing both lighting control items.
- RGB Glow block and Chisels & Bits Glow bit changes are now recorded as persistent dirty positions while MANUAL mode is active.
- Bake requests now capture a fixed batch of dirty positions at the time the Bake begins.
- Changes made during an active Bake remain pending for the next Bake instead of extending the current batch.
- Dirty positions in unloaded chunks are preserved instead of being discarded.
- Switching from MANUAL back to AUTO now performs catch-up processing for loaded dirty positions.
- Added world-saved RGB mode, Bake scope, and world ID data.
- Added client-side, per-world and per-dimension persistence for RGB light sections.
- Added persistence for full-block RGB source positions.
- Added persistence for Chisels & Bits RGB source color and energy data.
- Added persistence for unbaked MANUAL dirty positions.
- Added backward-compatible loading of previous RGB lightmap formats and one-time source reconciliation.
- Reworked Chisels & Bits RGB source validation for newly created, changed, weakened, and removed Glow bits.
- Limited MANUAL Bake bootstrap and render rebuilding to sections associated with the selected dirty positions.