character: drop player card; RU headings; growable attunements; AC

- PlayerCard removed — it duplicated the sidebar editors; the character
  page now shows only prepared spells and attunements
- headings are plain RU: Заготовленные заклинания / Атюнменты
  (no EN/RU double labels; h6 no longer lowercased)
- Attunements is Vec<Option<String>> instead of a fixed 3-slot array;
  '+ слот' appends a slot, so custom campaigns can track more items
  (old saved JSON parses: arrays map to Vec)
- PlayerData.ac (u8, serde default 0): manual armor-class input in the
  sidebar HP block (hp/оз, ac/КД), editable like the HP numbers

style/_character.scss

@@ -8,39 +8,8 @@
     overflow-y: auto;
 }
 
-.player-card {
-    display: flex;
-    align-items: center;
-    gap: 18px;
-
-    img {
-        width: 92px;
-        height: 92px;
-        object-fit: cover;
-        border-radius: 6px;
-        box-shadow: 0 0 0 2px crimson;
-    }
-
-    .player-meta {
-        display: flex;
-        flex-direction: column;
-        gap: 2px;
-    }
-
-    .player-name {
-        font-size: 1.5em;
-        font-weight: 900;
-    }
-
-    .player-class, .player-level, .player-xp {
-        font-weight: 300;
-        opacity: 0.8;
-    }
-}
-
 .prepared-spells, .attunements {
     h6 {
-        text-transform: lowercase;
         font-size: 1.1em;
         margin: 0 0 10px;
         font-weight: 900;
@@ -100,9 +69,7 @@
         font-weight: 900;
         min-width: 200px;
     }
-}
 
-.prepared-spells {
     .add-slot {
         @include mixins.button;
         margin-top: 10px;

style/_sidebar.scss

@@ -134,6 +134,14 @@ aside {
         .val {
             z-index: 2;
         }
+
+        .ac {
+            display: flex;
+            align-items: center;
+            gap: 6px;
+            padding-left: 10px;
+            border-left: 1px solid rgba(white, 0.15);
+        }
     }
 
     .hit-dice {