SaeLibVie

First release.

• GUI toolkit: retained widget tree with local coordinates, themes driven by color tokens, five layouts, draggable and resizable windows, modal and popup layers, context menus, toasts, confirm dialogs and a color picker.
• Around forty widgets, including buttons, text fields, a multi-line text area, lists, paged grids, scroll panels, tab panels, progress bars, fluid gauges, graphs, entity views and a 3D viewport.
• Screen bases for plain screens, container screens and three-region forms, with parent-screen navigation, cursor shapes, double-click detection and deferred tooltips.
• HUD element registry with an in-game layout editor, saved to config/saelibvie/hud.json.
• Themes from code, resource packs and config/saelibvie/themes.json, switchable with /saelibvie theme.
• Utility layer: RGBA color type with palettes, math and chunk helpers, chat-format-code parser, custom named text colors, item and fluid keys, search terms and network codec helpers.
• NBT editor for items, block entities, entities and players through /saelibvie nbtedit, with a public response handler registry.
• JEI integration: ingredient under the mouse on any library screen, plus ghost ingredient targets.
• Menu helpers: typed ContainerData syncing, button id allocation and a generic menu action payload.