refactor(github): extract language color map (JhaSourav07#572)

## Description

Fixes JhaSourav07#296

Extracted the language color mapping from `lib/github.ts` into a
dedicated `lib/svg/languageColors.ts` module to separate presentation
data from data-fetching logic.

Updated `lib/github.ts` to import and use `LANGUAGE_COLORS`.

## Pillar

- [ ] 🎨 Pillar 1 — New Theme Design
- [ ] 📐 Pillar 2 — Geometric SVG Improvement
- [ ] 🕐 Pillar 3 — Timezone Logic Optimization
- [x] 🛠️ Other (Bug fix, refactoring, docs)

## Visual Preview

Not applicable (refactoring change)

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [ ] I have tested these changes locally
(`localhost:3000/api/streak?user=YOUR_USERNAME`).
- [x] I have run `npm run format` and `npm run lint` locally and
resolved all errors (CI will fail otherwise).
- [x] My commits follow the Conventional Commits format (e.g.,
`feat(themes): ...`, `fix(calculate): ...`).
- [ ] I have updated `README.md` if I added a new theme or URL
parameter.
- [x] I have started the repo.
- [x] I have made sure that i have only one commit to merge in this PR.
- [ ] The SVG output matches the CommitPulse "premium quality" aesthetic
standard (no raw elements, smooth animations, correct fonts).
- [x] (Recommended) I joined the CommitPulse Discord community for
contributor discussions, mentorship, and faster PR support.

Author: JhaSourav07

lib/github.ts

@@ -3,6 +3,7 @@
 import type { ContributionCalendar } from '../types';
 import { calculateStreak } from './calculate';
 import { TTLCache } from './cache';
+import { LANGUAGE_COLORS } from './svg/languageColors';
 
 interface GitHubRepo {
   stargazers_count: number;
@@ -459,41 +460,12 @@ export async function getFullDashboardData(username: string, options: FetchOptio
     }
   });
 
-  // Fixed color mapping for common languages to avoid random colors
-  const languageColors: Record<string, string> = {
-    TypeScript: '#3178c6',
-    JavaScript: '#f1e05a',
-    Python: '#3572A5',
-    Java: '#b07219',
-    'C++': '#f34b7d',
-    HTML: '#e34c26',
-    CSS: '#563d7c',
-    Go: '#00ADD8',
-    Rust: '#dea584',
-
-    C: '#555555',
-    'C#': '#178600',
-    PHP: '#4F5D95',
-    Ruby: '#701516',
-    Swift: '#F05138',
-    Kotlin: '#A97BFF',
-    Dart: '#00B4AB',
-    Lua: '#000080',
-    R: '#198CE7',
-    Scala: '#c22d40',
-    Perl: '#0298c3',
-    Haskell: '#5e5086',
-    Elixir: '#6e4a7e',
-    Vue: '#41b883',
-    Svelte: '#ff3e00',
-  };
-
   const totalLangs = Object.values(langCounts).reduce((a, b) => a + b, 0);
   const languages = Object.entries(langCounts)
     .map(([name, count]) => ({
       name,
       percentage: Math.round((count / totalLangs) * 100),
-      color: languageColors[name] || '#a855f7', // fallback purple
+      color: LANGUAGE_COLORS[name] || '#a855f7', // fallback purple
     }))
     .sort((a, b) => b.percentage - a.percentage)
     .slice(0, 5); // top 5

lib/svg/languageColors.ts

@@ -0,0 +1,26 @@
+export const LANGUAGE_COLORS: Record<string, string> = {
+  TypeScript: '#3178c6',
+  JavaScript: '#f1e05a',
+  Python: '#3572A5',
+  Java: '#b07219',
+  'C++': '#f34b7d',
+  HTML: '#e34c26',
+  CSS: '#563d7c',
+  Go: '#00ADD8',
+  Rust: '#dea584',
+  C: '#555555',
+  'C#': '#178600',
+  PHP: '#4F5D95',
+  Ruby: '#701516',
+  Swift: '#F05138',
+  Kotlin: '#A97BFF',
+  Dart: '#00B4AB',
+  Lua: '#000080',
+  R: '#198CE7',
+  Scala: '#c22d40',
+  Perl: '#0298c3',
+  Haskell: '#5e5086',
+  Elixir: '#6e4a7e',
+  Vue: '#41b883',
+  Svelte: '#ff3e00',
+};