Update changelog and README to reflect removal of time-based shader animation; emphasize position-driven rendering for improved performance

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## Unreleased
+
+- Removed internal time-based shader animation.
+- Updated shader behavior to be driven by tilt/position input only.
+
 ## 0.1.0
 
 - Initial release of `holo_shiny`.

README.md

@@ -11,6 +11,7 @@ It exposes two widget layers:
 
 - GLSL shader-driven holographic effects
 - Optional motion input via sensors or custom tilt stream
+- Position-driven rendering: visuals respond to tilt/input position with no internal time animation
 - Generic wrapper API for any widget via `Shiny(child: ...)`
 - Card API with `background`, `foreground`, `shape`, and drag tilt via `ShinyCard`
 - Built-in sparkle presets including `none` (default), 8-point star, 5-point star, rectangle, diamond, hexagon, random polygon, and confetti
@@ -134,6 +135,7 @@ Important defaults:
 ## Platform Notes
 
 - Shader uses Flutter runtime effects and avoids derivative functions (`dFdx`, `dFdy`, `fwidth`) for web compatibility.
+- Shader output is deterministic for a given input state and is driven by tilt/position values instead of a ticking time uniform.
 - If a sensor is unavailable, motion input simply emits no events.
 
 ## Example