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.

src/ui/alert.css

@@ -0,0 +1,43 @@
+.alert {
+  position: relative;
+  display: flex;
+  gap: var(--size-3);
+  padding: var(--size-4) var(--size-6);
+  background: var(--bg-1);
+  border: var(--border-0);
+  border-radius: var(--radius-md);
+  font-size: var(--font-sm);
+}
+
+.alert-title {
+  font-weight: 600;
+  margin: 0 0 var(--size-1) 0;
+}
+
+.alert-body {
+  margin: 0;
+}
+
+.alert-success {
+  border: none;
+  color: var(--success);
+  background: color-mix(in srgb, var(--success) 10%, var(--bg-0));
+}
+
+.alert-warning {
+  border: none;
+  color: var(--warning);
+  background: color-mix(in srgb, var(--warning) 10%, var(--bg-0));
+}
+
+.alert-danger {
+  border: none;
+  color: var(--danger);
+  background: color-mix(in srgb, var(--danger) 10%, var(--bg-0));
+}
+
+.alert-info {
+  border: none;
+  color: var(--accent);
+  background: color-mix(in srgb, var(--accent) 10%, var(--bg-0));
+}