refactor(src/shared/styles): drop unused color definitionsRemoved the colors.css file that defined unused theme variables, reducing bundle size and eliminating stale style references.

- New Features: —
- Enhancements: removed unused color definitions
- Bug Fixes: —

src/shared/styles/colors.css

@@ -1,32 +0,0 @@
-:vars {
-  --foreground: #e2e2e9;
-  --background: #121318;
-  --cursor: #e2e2e9;
-  --primary: #b0c6ff;
-  --on-primary: #152e60;
-  --secondary: #c0c6dc;
-  --on-secondary: #293042;
-  --tertiary: #e0bbdd;
-  --on-tertiary: #412742;
-  --surface: #121318;
-  --surface-bright: #38393f;
-  --error: #ffb4ab;
-  --error-dim: #ff8677;
-  --on-error: #690005;
-  --error-container: #93000a;
-  --outline: #8f9099;
-  --shadow: #000000;
-  --red: #ffb2b9;
-  --red-dim: #ff7f8a;
-  --green: #95d5a7;
-  --green-dim: #70c688;
-  --yellow: #b8cf84;
-  --yellow-dim: #a2c05f;
-  --blue: #b7c4ff;
-  --blue-dim: #849afe;
-  --magenta: #e4b7f3;
-  --magenta-dim: #d38beb;
-  --cyan: #82d3e2;
-  --cyan-dim: #58c4d8;
-  --white: #82d3e0;
-}