Draw the plain tooltip without Tailwind

Plan step 36. <x-tooltip> renders data-md-tooltip and data-md-side on
the bubble and data-md-tooltip-anchor on a standalone trigger's wrapper;
tooltip.css draws PlainTooltipTokens' inverse-surface bubble, its anchor
placement and flips per side, and the fade on the fast effects spring
with @starting-style.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

tests/Feature/Components/ButtonTest.php

@@ -160,7 +160,7 @@ it('anchors its tooltip to itself', function () {
 
     expect($anchor)->not->toBeEmpty()
         ->and($html)->toContain("position-anchor: {$anchor[1]}")
-        ->toContain('[position-area:bottom]')
+        ->toContain('data-md-side="bottom"')
         ->not->toContain('aria-label="Saves the draft"');
 });