fix: castable mixin redundant optional chaining

[ronald-urbina]

Removed unnecessary ?. optional chaining in the muted, volume,
duration, and currentTime getters of CastableMediaMixin

• In each case, #castPlayer is already verified truthy by the enclosing
  if condition, so the optional chaining was a no-op

---

Note

Medium Risk
Switching PeerTubeVideoElement to extend HTMLElement directly can break non-browser/SSR environments that relied on the previous fallback base class. README edits are low risk but reduce documented guidance around required transpilation/browser targets.

Overview
Removes the README’s Browser support guidance about packages shipping as ESNext and relying on consumer transpilation.

Updates PeerTubeVideoElement to extend HTMLElement directly (dropping the prior globalThis.HTMLElement ?? class {} fallback), tightening the assumption that a native DOM environment is present.

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SSR fallback removed for HTMLElement base class

High Severity

The globalThis.HTMLElement ?? class {} fallback was replaced with a bare HTMLElement reference. Every other element in the codebase (e.g., cloudflare-video-element, spotify-audio-element, tiktok-video-element, twitch-video-element) uses the globalThis.HTMLElement ?? class {} pattern to avoid a ReferenceError in non-browser environments like SSR or Node.js. This change breaks that SSR safety for PeerTubeVideoElement.

 

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