feat(*): one task editor, vim navigation and undo

src/tailwind.css

@@ -270,6 +270,25 @@
   }
 }
 
+/* A key, drawn as one: the heavier bottom edge is the keycap, not a shadow. */
+@utility kbd {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 1.15rem;
+  height: 1.15rem;
+  padding: 0 0.25rem;
+  font-family: inherit;
+  font-size: 10px;
+  font-variant-numeric: tabular-nums;
+  line-height: 1;
+  color: var(--muted-foreground);
+  background: var(--background);
+  border: 1px solid var(--border);
+  border-bottom-color: color-mix(in oklab, var(--border) 55%, var(--foreground));
+  border-radius: var(--radius-sm);
+}
+
 @utility scrollbar-none {
   -ms-overflow-style: none;
   scrollbar-width: none;