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This patch extracts the drawing logic from redr_raylib.c and moves it
into a new abstraction layer in view.c, introducing a tree-based view
system for UI rendering.
- view.c defines a hierarchical 'view' structure with polymorphic draw methods.
- root and ed_buf views are implemented as a proof of concept.
- redr.c (via redr.h) now exposes only backend rendering primitives (text, clear, measure).
- main.c is updated to instantiate and draw the view tree.
This separation clarifies the responsibilities between layout (view)
and rendering (redr) and prepares the system for future UI extensions
such as nested panels, split views, and overlays.
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