fix(themes): correct highcontrast text color to #ffffff for WCAG comp… (JhaSourav07#1207)

## Description

Fixes JhaSourav07#1200 

The `highcontrast` theme in `lib/svg/themes.ts` had its text color set
to `#888888`
(medium gray) on a background of `#0a0a0a` (near-black). This produced a
contrast
ratio of only ~3.5:1 — below the WCAG AA minimum of 4.5:1 and completely
contradicting the purpose of a theme named `highcontrast`.

Changed text color to `#ffffff` (white), achieving a contrast ratio of
~21:1,
which passes WCAG AAA — the highest accessibility standard.

## Pillar

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

## Visual Preview

| Before ❌ (~3.5:1 contrast ratio) | After ✅ (~21:1 contrast ratio) |
|---|---|
| <img width="1198" height="841" alt="image"
src="https://github.com/user-attachments/assets/613f6bbd-3a50-46ed-93bc-2f94cabd34dd"
/> | <img width="1201" height="841" alt="image"
src="https://github.com/user-attachments/assets/39ac4164-85fa-4d62-973a-e2e68f522730"
/> |

## Changes Made

- `lib/svg/themes.ts` — changed `highcontrast` text from `888888` to
`ffffff`
- `THEMES.md` — updated theme gallery table to reflect new text color
- `README.md` — updated theme presets table to reflect new text color

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally
(`localhost:3000/api/streak?user=jhasourav07&theme=highcontrast`).
- [x] I have run `npm run format` and `npm run lint` locally and
resolved all errors.
- [x] My commits follow the Conventional Commits format (`fix(themes):
...`).
- [x] I have updated `README.md` as I modified an existing theme.
- [x] I have starred the repo.
- [x] I have made sure that I have only one commit to merge in this PR.
- [x] The SVG output matches the CommitPulse "premium quality" aesthetic
standard.

Author: JhaSourav07

README.md

@@ -192,7 +192,7 @@ URL Parameter > Theme Default > System Fallback
 | `light`            | Clean & minimal             | `ffffff` | `0969da` | `24292f` |
 | `gruvbox`          | retro warm dark             | `282828` | `fe8019` | `ebdbb2` |
 | `random`           | Surprise theme on reload    | _varies_ | _varies_ | _varies_ |
-| `highcontrast`     | Accessibility high contrast | `0a0a0a` | `ff4500` | `888888` |
+| `highcontrast`     | Accessibility high contrast | `0a0a0a` | `ff4500` | `ffffff` |
 
 > **`auto` uses CSS `@media (prefers-color-scheme)`** inside the SVG so the badge switches between the `light` and `dark` palettes based on the viewer's OS setting — no JavaScript required. This is ideal for GitHub profile READMEs where visitors may use either mode.
 

THEMES.md

@@ -25,7 +25,7 @@ https://commitpulse.vercel.app/api/badge?username=YOUR_USERNAME&theme=<slug>
 | nord         | `#2e3440`  | `#d8dee9` | `#88c0d0` |
 | synthwave    | `#0d0221`  | `#f8f8f2` | `#ff2d78` |
 | gruvbox      | `#282828`  | `#ebdbb2` | `#fe8019` |
-| highcontrast | `#0a0a0a`  | `#888888` | `#ff4500` |
+| highcontrast | `#0a0a0a`  | `#ffffff` | `#ff4500` |
 
 ---
 

lib/svg/themes.ts

@@ -24,7 +24,7 @@ export const themes: Record<string, BadgeTheme> = {
   synthwave: makeTheme('0d0221', 'f8f8f2', 'ff2d78'),
   gruvbox: makeTheme('282828', 'ebdbb2', 'fe8019'),
   aurora_cyberpunk: makeTheme('090B13', 'EAF2FF', '9D5CFF'),
-  highcontrast: makeTheme('0a0a0a', '888888', 'ff4500'),
+  highcontrast: makeTheme('0a0a0a', 'ffffff', 'ff4500'),
   catppuccin_latte: makeTheme('eff1f5', '4c4f69', '1e66f5'),
   solarized_light: makeTheme('fdf6e3', '586e75', '268bd2'),
   gruvbox_light: makeTheme('fbf1c7', '3c3836', 'd65d0e'),