Toolbar buttons: lock line-height + min-height so a and button render same size

static/index.html

@@ -103,7 +103,12 @@
     font-size: 10px; font-weight: 400; letter-spacing: 0.5px;
     padding: 5px 11px; border: 1px solid #ccc; border-radius: 3px;
     background: #fff; color: var(--muted); cursor: pointer;
-    transition: all 0.15s; text-decoration: none; display: inline-block;
+    transition: all 0.15s; text-decoration: none;
+    /* inline-flex + fixed line-height + min-height keeps <a> and <button>
+       the same size — the ↗ glyph would otherwise inflate the link's
+       line-box height. */
+    display: inline-flex; align-items: center;
+    line-height: 1.4; min-height: 26px; box-sizing: border-box;
   }
   .btn:hover { border-color: var(--muted-3); color: var(--ink); }
   .btn:disabled { opacity: 0.6; cursor: wait; }