Refactor: Modularize app.tsx and Decompose GL Utilities

[dhruvicious]

This PR performs a structural refactor of the application by:

1. Splitting the monolithic app.tsx into dedicated UI components and custom hooks.
2. Decomposing the previously consolidated GLUtils module (located under /utils) into individual, responsibility-focused modules.

The refactor improves separation of concerns, maintainability, and long-term scalability without introducing any functional changes.

Extracted Components:

1. BgSelect

Moved Components:

1. ResizableWindow
2. PresetControls
3. Controls

Extracted Hooks:

1. useBgTextureState
2. useCanvasInfo
3. useMouseSpring
4. useResizeObserver
5. useWebGLRenderer

Previously, WebGL-related logic was grouped inside a single GLUtils file within /utils.
This PR splits that file into dedicated modules under /GLUtils:

1. CreateEmptyTexture
2. FrameBuffer
3. LoadTextureFromURL
4. MultiPassRenderer
5. RenderPass
6. ShaderProgram
7. UpdateVideoTexture
8. types
9. index (barrel export)

Functional Impact:
None.
This is a non-breaking structural refactor.

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