fix(pptx): show shadow-root slideshow content - #199
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Fixes native PPTX slideshow rendering inside an open ShadowRoot.
The viewer now resolves one shared style/presentation root, so fullscreen slides keep their CSS instead of being laid out off-screen. The browser harness also verifies that the active shadow-root slide is visible, not just present in the DOM.
Validated locally with build, type-check, tests, sanitizer checks, browser smoke, and all 17 slideshow checks.