feat: news and notifications page (#1660)

* Add news and notifications

* Add localization for news and notifications

* Remove news caching

* Add fetching news befor openning news page

* Fix not updating news page

* Delete debug output

* Remove news and notificztions with only self-hosted servers

* Add stack filters to fetching news request

* Add fetching news with changing stack in the client

* small refactoring

* polishing

* Rename newsModel files and fix naming in code

* fix: remove custom signals; fetch news only on stack expansion

* chore: delete unnecessary code

* chore: code style fixes

* fix: fixed memory leak in gateway controller

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Co-authored-by: vkamn <vk@amnezia.org>

client/images/controls/news-unread.svg

@@ -0,0 +1,14 @@
+<svg width="24" height="24" viewBox="0 0 74 74" fill="none" xmlns="http://www.w3.org/2000/svg">
+<g clip-path="url(#clip0_4_34)">
+<path d="M55.5 12.3333H18.5C15.0942 12.3333 12.3333 15.0943 12.3333 18.5V55.5C12.3333 58.9058 15.0942 61.6667 18.5 61.6667H55.5C58.9057 61.6667 61.6666 58.9058 61.6666 55.5V18.5C61.6666 15.0943 58.9057 12.3333 55.5 12.3333Z" stroke="#CBCAC8" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21.5833 24.6667H52.4167" stroke="#CBCAC8" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21.5833 37H52.4167" stroke="#CBCAC8" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M21.5833 49.3333H40.0833" stroke="#CBCAC8" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+<circle cx="61.5" cy="12.5" r="15" fill="#FBB36B" stroke="#1C1D21" stroke-width="5"/>
+</g>
+<defs>
+<clipPath id="clip0_4_34">
+<rect width="74" height="74" fill="white"/>
+</clipPath>
+</defs>
+</svg>

client/images/controls/news.svg

@@ -0,0 +1,8 @@
+<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" fill="none" stroke="#CBCAC8" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round">
+  <!-- Основа газеты -->
+  <rect x="4" y="4" width="16" height="16" rx="2"/>
+  <!-- Линии текста -->
+  <line x1="7" y1="8" x2="17" y2="8"/>
+  <line x1="7" y1="12" x2="17" y2="12"/>
+  <line x1="7" y1="16" x2="13" y2="16"/>
+</svg>

client/images/controls/unread-dot.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 35 35" fill="none" xmlns="http://www.w3.org/2000/svg">
+<circle cx="17.5" cy="17.5" r="15" fill="#FBB36B" stroke="#1C1D21" stroke-width="5"/>
+</svg>