web/donate: add a share card with qr and buttons

also:
- fixed more scaling quirks
- fixed thick icons
- fixed icon padding

web/src/components/donate/DonateCardContainer.svelte

@@ -75,9 +75,10 @@
         align-items: center;
         font-size: 16px;
         gap: 4px;
+        font-weight: 500;
     }
 
-    @media screen and (max-width: 550px) {
+    @media screen and (max-width: 865px) {
         :global(.donate-card) {
             --donate-card-main-padding: 18px;
         }