fix: stabilize mini app mobile navigation

frontend/src/styles/webapp.css

@@ -2154,8 +2154,11 @@ a {
   display: grid;
   grid-template-columns: repeat(var(--bottom-nav-visible-items, 3), minmax(0, 1fr));
   grid-auto-flow: column;
+  grid-auto-columns: minmax(0, 1fr);
+  grid-auto-rows: 1fr;
+  height: var(--bottom-nav-height);
   gap: 2px;
-  min-height: 64px;
+  min-height: var(--bottom-nav-height);
   overflow: hidden;
   border: 1px solid var(--border);
   border-radius: var(--radius);
@@ -2174,7 +2177,11 @@ a {
 
 .bottom-nav button {
   display: grid;
+  grid-template-rows: 22px minmax(0, 12px);
+  width: 100%;
+  height: 100%;
   min-width: 0;
+  min-height: 0;
   place-items: center;
   align-content: center;
   gap: 4px;
@@ -2185,6 +2192,13 @@ a {
   font-weight: 800;
   overflow: hidden;
   padding: 6px 2px;
+  line-height: 1;
+}
+
+.bottom-nav button > svg {
+  width: 21px;
+  height: 21px;
+  min-width: 0;
 }
 
 .bottom-nav button.active {
@@ -2193,10 +2207,12 @@ a {
 
 .bottom-nav .bottom-nav-label {
   display: block;
+  width: 100%;
   max-width: 100%;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  font-size: 10px;
   line-height: 1.1;
 }
 
@@ -2204,12 +2220,40 @@ a {
   display: none !important;
 }
 
+@media (max-width: 460px) {
+  .bottom-nav.bottom-nav-many {
+    height: 58px;
+    min-height: 58px;
+  }
+
+  .bottom-nav.bottom-nav-many button {
+    grid-template-rows: 1fr;
+    gap: 0;
+    padding: 0 2px;
+  }
+
+  .bottom-nav.bottom-nav-many .bottom-nav-label {
+    display: none;
+  }
+
+  .bottom-nav.bottom-nav-many .nav-attention-dot {
+    top: 8px;
+    right: calc(50% - 18px);
+  }
+
+  .bottom-nav.bottom-nav-many .nav-badge-floating {
+    top: 6px;
+    right: calc(50% - 24px);
+  }
+}
+
 @media (max-width: 380px) {
   .bottom-nav.bottom-nav-many {
     min-height: 58px;
   }
 
   .bottom-nav.bottom-nav-many button {
+    grid-template-rows: 1fr;
     gap: 0;
     padding: 0 2px;
   }
@@ -2231,10 +2275,12 @@ a {
 
 @media (max-width: 360px) {
   .bottom-nav {
+    height: 56px;
     min-height: 56px;
   }
 
   .bottom-nav button {
+    grid-template-rows: 1fr;
     gap: 0;
     padding: 0 2px;
   }
@@ -3149,6 +3195,7 @@ a {
     display: grid !important;
     grid-template-columns: 22px 1fr !important;
     grid-template-rows: auto !important;
+    height: auto !important;
     align-items: center !important;
     justify-items: start !important;
     gap: 12px !important;