fix(ui): equal column widths for block-drawer blocks (#15867)

# What?

Fixes unequal block-drawer column widths causing layout breaking with
long block labels

## Before
<img width="1330" height="1319" alt="image"
src="https://github.com/user-attachments/assets/9281cf3b-994f-47c9-bc25-001b40e61282"
/>

## After
<img width="1321" height="1298" alt="image"
src="https://github.com/user-attachments/assets/85dc44c7-cfd3-4591-96f2-ef9cf41de46c"
/>

---------

Co-authored-by: Patrik Kozak <35232443+PatrikKozak@users.noreply.github.com>

Author: vanska

packages/ui/src/fields/Blocks/BlockSelector/index.scss

@@ -11,7 +11,7 @@
       padding: 0;
       list-style: none;
       display: grid;
-      grid-template-columns: repeat(6, 1fr);
+      grid-template-columns: repeat(6, minmax(0, 1fr));
       gap: base(1);
     }
 
@@ -59,7 +59,7 @@
 
     @include large-break {
       &__blocks {
-        grid-template-columns: repeat(5, 1fr);
+        grid-template-columns: repeat(5, minmax(0, 1fr));
       }
     }
 
@@ -69,7 +69,7 @@
       }
 
       &__blocks {
-        grid-template-columns: repeat(3, 1fr);
+        grid-template-columns: repeat(3, minmax(0, 1fr));
       }
 
       &__block-groups {
@@ -87,7 +87,7 @@
       }
 
       &__blocks {
-        grid-template-columns: repeat(2, 1fr);
+        grid-template-columns: repeat(2, minmax(0, 1fr));
       }
 
       &__block-groups {