fix(css): an icon-only grid button centres its icon again

Obsidian styles every `button` with `justify-content: center`, so the reset
answers with `flex-start` - which also lands on a grid button and overrides
the inline half of its `place-items: center`. The rail's connection dot came
out pinned 12px left of centre inside its own hit area.

src/tailwind.css

@@ -201,6 +201,12 @@
   cursor: pointer;
 }
 
+/* A grid button centres by `place-items`, which the rule above would override
+   for its inline axis: an icon-only button ends up pinned to its left edge. */
+.beaver-root.beaver-root button:is(.grid, .inline-grid) {
+  justify-content: initial;
+}
+
 .beaver-root.beaver-root button:hover {
   background: transparent;
 }