Cinematic Zoom

1.21.1 Backport Changes

• Minecraft / Mappings: Updated target to Minecraft 1.21.1, Parchment mappings 2024.11.17, and NeoForge 21.1.215.
• Branch: Added branch 1.21.1 for the backport.
• Keybinding: Replaced KeyMapping.Category usage with a string category key to match the 1.21.1 API.
• Mod Metadata: Added required loader fields to src/main/templates/META-INF/neoforge.mods.toml (modLoader and loaderVersion).
• Mixin (FOV): Adjusted GameRendererMixin to match the runtime GameRenderer#getFov(Camera, float, boolean) signature (returns double).
• Crash Fix: Removed the float-return injection that caused a Double→Float ClassCastException; now uses the Double-return injection matching the runtime descriptor.
• Build & Test: Rebuilt successfully and ran the dev client to verify startup without the previous ClassCastException.

Notes:

• These changes are limited to the backport; API differences between 1.21.10 and 1.21.1 were handled with minimal, targeted edits.