fix(colorscheme): update theme name from "catppuccin-mocha" to "Catppuccin Frappe"

feat(shaders): add CRT-styled shader with public domain license and adjustments for Ghostty, including parameter definitions and tonal control functions.

refactor(shader): optimize color conversion and output to SRGB for better visual quality

feat(shaders): add flicker, glow, and starfield shader effects for terminal ambiance.

.config/ghostty/shaders/flicker.glsl

@@ -0,0 +1,42 @@
+// https://github.com/12jihan/ghostty_shaders/blob/main/flicker.glsl
+
+float rand(vec2 co) {
+    return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
+}
+
+void mainImage(out vec4 fragColor, in vec2 fragCoord) {
+    vec2 uv = fragCoord/iResolution.xy;
+    
+    // Random timing for glitches
+    float timeScale = floor(iTime * 2.0);
+    float randomTrigger = step(0.52, rand(vec2(timeScale, 0.80)));
+    
+    // RGB Split with random intensity
+    float splitStrength = randomTrigger * 0.20 * rand(vec2(timeScale, 2.0));
+    float r = texture(iChannel0, vec2(uv.x + splitStrength, uv.y)).r;
+    float g = texture(iChannel0, uv).g;
+    float b = texture(iChannel0, vec2(uv.x - splitStrength, uv.y)).b;
+    
+    // Random vertical glitch blocks
+    float blockNoise = rand(vec2(floor(uv.y * 32.0), timeScale));
+    float blockOffset = (step(0.996, blockNoise) * 2.0 - 1.0) * 0.02;
+    uv.x = uv.x + blockOffset * randomTrigger;
+    
+    // CRT scanlines
+    float scanline = sin(uv.y * 1000.0) * 0.04 + 0.96;
+    
+    // Vertical sync glitch
+    float vSync = sin(uv.y * 50.0 + iTime * 5.0) * randomTrigger * 0.01;
+    uv.x += vSync;
+    
+    vec3 color = vec3(r, g, b);
+    
+    // Apply scanlines and noise
+    color *= scanline;
+    color *= (0.95 + rand(uv + timeScale) * 0.05);
+    
+    // Random color noise at glitch moments
+    color += randomTrigger * rand(uv + iTime) * 0.01;
+    
+    fragColor = vec4(color, 0.95);
+}