fix: make poll responsive

Author: MartinCupela

src/components/Poll/styling/Poll.scss

@@ -6,13 +6,8 @@
     flex-direction: column;
     gap: var(--str-chat__spacing-xl);
     padding: var(--str-chat__spacing-xs);
-    width: calc(
-      var(--str-chat__message-with-attachment-max-width) - calc(
-          2 * var(--str-chat__spacing-xs)
-        )
-    );
+    min-width: min(260px, 100%);
     max-width: 100%;
-    min-width: 260px;
     font: var(--str-chat__font-caption-default);
 
     button {