feat: per-theme accent + Activity WhatsApp(en)/GitHub cards, softer icon borders

- theme: store accent separately for light/dark (theme-core/controls)
- en contacts: WhatsApp card instead of VK (wa.me link)
- Activity: add GitHub card (logo webp) in both locales
- mp-card__image border uses --line to match card (less contrast)

src/partials/contact-section.en.html

@@ -3,7 +3,7 @@
         <h2 class="section__title">Contact</h2>
         <ul class="contact-grid">
           <li><a class="contact-card contact-card--link contact-card--brand-tg" href="https://t.me/mamadaevv" rel="noopener noreferrer"><span class="contact-card__corner" aria-hidden="true"></span><span class="contact-card__icon" aria-hidden="true"><img src="{{assetPrefix}}assets/shared/icons/tg.svg" alt="" width="24" height="24" loading="eager" decoding="async" /></span><span class="contact-card__body"><span class="contact-card__name">Telegram</span><span class="contact-card__hint">I'll reply today</span></span></a></li>
-          <li><a class="contact-card contact-card--link contact-card--brand-vk" href="https://vk.com/mamadaevv" rel="noopener noreferrer"><span class="contact-card__corner" aria-hidden="true"></span><span class="contact-card__icon" aria-hidden="true"><img src="{{assetPrefix}}assets/shared/icons/vk.svg" alt="" width="24" height="24" loading="eager" decoding="async" /></span><span class="contact-card__body"><span class="contact-card__name">VK</span><span class="contact-card__hint">Stable connection</span></span></a></li>
+          <li><a class="contact-card contact-card--link contact-card--brand-whatsapp" href="https://wa.me/qr/E2AWW5ZHE3ANJ1" rel="noopener noreferrer"><span class="contact-card__corner" aria-hidden="true"></span><span class="contact-card__icon" aria-hidden="true"><img src="{{assetPrefix}}assets/shared/icons/whatsapp.svg" alt="" width="24" height="24" loading="eager" decoding="async" /></span><span class="contact-card__body"><span class="contact-card__name">WhatsApp</span><span class="contact-card__hint">Stable connection</span></span></a></li>
 
           <li><button type="button" class="contact-card contact-card--action contact-card--brand-email" data-contact-copy data-email-b64="bmlrQG1hbWFkYWV2di5zaXRl" data-hint-default="Copy address" aria-label="Copy email address to clipboard"><span class="contact-card__corner contact-card__corner--copy" aria-hidden="true"></span><span class="contact-card__icon contact-card__icon--accent" aria-hidden="true"></span><span class="contact-card__body"><span class="contact-card__name">Email</span><span class="contact-card__hint" data-contact-copy-hint>Copy address</span></span></button></li>
         </ul>

src/partials/mini-projects-section.en.html

@@ -108,6 +108,36 @@
                 </div>
               </a>
             </li>
+            <li class="mini-projects-grid__item" data-mp-cells="2">
+              <a
+                class="mp-card mp-card--link mp-card--horizontal mp-card--hor-image"
+                href="https://github.com/mamadaevv"
+                target="_blank"
+                rel="noopener noreferrer"
+                aria-label="GitHub — open profile"
+              >
+                <div class="mp-card__media" aria-hidden="true">
+                  <img
+                    class="mp-card__image"
+                    src="{{assetPrefix}}assets/misc/github_logo.webp"
+                    alt=""
+                    width="800"
+                    height="800"
+                    loading="lazy"
+                    decoding="async"
+                  />
+                </div>
+                <div class="mp-card__body">
+                  <h3 class="mp-card__title">
+                    GitHub
+                    <span class="mp-card__ext" aria-hidden="true"></span>
+                  </h3>
+                  <p class="mp-card__desc">
+                    My projects and code experiments.
+                  </p>
+                </div>
+              </a>
+            </li>
             <li class="mini-projects-grid__item" data-mp-cells="2">
               <a
                 class="mp-card mp-card--link mp-card--compact"

src/partials/mini-projects-section.html

@@ -108,6 +108,36 @@
                 </div>
               </a>
             </li>
+            <li class="mini-projects-grid__item" data-mp-cells="2">
+              <a
+                class="mp-card mp-card--link mp-card--horizontal mp-card--hor-image"
+                href="https://github.com/mamadaevv"
+                target="_blank"
+                rel="noopener noreferrer"
+                aria-label="GitHub — открыть профиль"
+              >
+                <div class="mp-card__media" aria-hidden="true">
+                  <img
+                    class="mp-card__image"
+                    src="{{assetPrefix}}assets/misc/github_logo.webp"
+                    alt=""
+                    width="800"
+                    height="800"
+                    loading="lazy"
+                    decoding="async"
+                  />
+                </div>
+                <div class="mp-card__body">
+                  <h3 class="mp-card__title">
+                    GitHub
+                    <span class="mp-card__ext" aria-hidden="true"></span>
+                  </h3>
+                  <p class="mp-card__desc">
+                    Мои проекты и эксперименты с кодом.
+                  </p>
+                </div>
+              </a>
+            </li>
             <li class="mini-projects-grid__item" data-mp-cells="2">
               <a
                 class="mp-card mp-card--link mp-card--compact"