feat(ui): component redesign pass and fixes, release ui 0.8.87

Redesign
- Shared field foundation rules (duplicated across 15 form components and
  emitted globally) are now identical everywhere, so later copies no longer
  silently override earlier redesigns.
- Drawn checkbox and radio controls, white switch thumbs (the thumb was the
  text colour, a black blob in light mode), recessed field wells, keycap
  actions in Modal, Drawer, Popover, Toaster, Pagination, Stepper, DataTable.
- Menus (Dropdown, ContextMenu, Popover, Select dropdown, Navbar panels) share
  one flat raised panel with neutral hover rows and mono section labels.
- Alerts with an accent rail and icon chip; card headers without the grey
  band; accordion, collapse, list, list group, timeline, stats, metrics,
  chat, skeleton, avatar group, clipboard, splitter, section, sidebar,
  navbar and upload progress restyled.
- Chart rebuilt: nice y-axis ticks, gridlines, rounded bars, line and area
  modes, hover tooltips, hidden series leave the scale.

Fixes
- Checkbox and radio labels toggle their input again (empty for="" broke it).
- TimePicker kept every clicked time pressed; only the chosen hour and
  minute are pressed now, and nothing is pressed before a value exists.
- ColorPicker hex readout now follows the picked colour.
- Disabled FileInput no longer shows the native file-input text.
- Date and time panels float instead of pushing content.
- ContextMenu opened at the pointer closes on scroll.
- Drawer left/top/bottom placements slide from their own edge again.
- Image-only Card no longer renders an empty body strip.
- Timeline supports item.time, current/upcoming states, sizes and
  compact/alternate variants; showcase demos use distinct variants.
- ChatBubble: delivery receipts (sending/sent/delivered/read/failed/error)
  and meta aligned to its bubble.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ui/test/ui.test.ts

@@ -898,7 +898,7 @@ test("alert exposes configurable radius and elevation treatments", async () => {
   expect(css).toContain('.wrn-next--alert[data-radius="xl"]');
   expect(css).toContain('.wrn-next--alert[data-shadow="lg"]');
   expect(css).toContain("border-radius: calc(var(--wrn-radius, 0.75rem) * 1.75)");
-  expect(css).toContain("0 20px 48px color-mix(in srgb, #000 24%, transparent)");
+  expect(css).toContain("box-shadow: var(--wrn-shadow-3)");
 });
 
 test("avatar renders images, fallbacks, presence, badges, tooltips, and media copy", async () => {
@@ -1430,7 +1430,7 @@ test("basic fields suppress native popups and render package constraint messages
 
   const selectSource = readFileSync(uiComponentPath("Select"), "utf8");
   expect(selectSource).toContain("appearance: none");
-  expect(selectSource).toContain("background-color: var(--wrn-color-surface)");
+  expect(selectSource).toContain("background-color: var(--wrn-color-input-background, var(--wrn-color-surface))");
   expect(selectSource).toContain("wrn-next__select-indicator");
 });
 
@@ -3854,8 +3854,9 @@ test("chart renders accessible SVG bars and emits point and legend outputs", asy
   for (const name of ["dataPointClick", "select", "legendToggle"]) {
     root.addEventListener(name, () => events.push(name));
   }
-  expect(root.querySelectorAll("svg rect")).toHaveLength(2);
-  (root.querySelector("svg rect") as SVGElement).dispatchEvent(
+  expect(root.querySelectorAll("svg path.wrn-chart__bar")).toHaveLength(2);
+  expect(root.querySelectorAll("button.wrn-chart__hit")).toHaveLength(2);
+  (root.querySelector("button.wrn-chart__hit") as HTMLElement).dispatchEvent(
     new (dom.window as { Event: typeof Event }).Event("click", { bubbles: true }),
   );
   (root.querySelector(".wrn-chart__legend button") as HTMLButtonElement).click();