feat: add 13 components adapted from Oat UI

Components (.cljc + .css + tests):
- Alert (success/warning/danger/info variants)
- Badge (primary/secondary/outline/success/warning/danger)
- Card (card/card-header/card-body/card-footer)
- Accordion (collapsible with open/closed state)
- Table (headers/rows, striped/bordered variants)
- Dialog (modal with header/body/footer sections)
- Breadcrumb (nav with active item)
- Pagination (current/total with prev/next)
- Progress (value bar with color variants)
- Spinner (sm/md/lg sizes)
- Skeleton (line/box/circle/heading placeholders)
- Switch (toggle with checked/disabled states)
- Tooltip (hover text via data-tooltip attr)

CSS-only additions:
- Form elements (inputs, selects, checkboxes, radios, range, groups)
- Grid (12-column system with offsets, responsive)
- Utilities (flex, spacing, alignment, sr-only)

Also adds warning/fg-on-warning tokens to light and dark themes.
All 3 dev targets updated with full component showcase.
40 tests, 213 assertions, all passing.

test/ui/spinner_test.clj

@@ -0,0 +1,21 @@
+(ns ui.spinner-test
+  (:require [clojure.test :refer [deftest is testing]]
+            [ui.spinner :as spinner]))
+
+(deftest spinner-class-list-test
+  (testing "default size (md)"
+    (is (= ["spinner"] (spinner/spinner-class-list {})))
+    (is (= ["spinner"] (spinner/spinner-class-list {:size :md}))))
+
+  (testing "small size"
+    (is (= ["spinner" "spinner-sm"] (spinner/spinner-class-list {:size :sm}))))
+
+  (testing "large size"
+    (is (= ["spinner" "spinner-lg"] (spinner/spinner-class-list {:size :lg})))))
+
+(deftest spinner-component-test
+  (testing "renders a span"
+    (let [result (spinner/spinner {})]
+      (is (= :span (first result)))
+      (is (= "spinner" (get-in result [1 :class])))
+      (is (= "status" (get-in result [1 :role]))))))