docs(website): the Custom effects page

[EtienneLescot]

The website page of the shader effects stack (docs/shader-effects.md, part L). Part of #1210.

What it adds

• website/docs/effects.md, Custom effects, in the Features sidebar after AI editing:
  • asking an agent for an effect;
  • the Effects row and its inspector (settings, Applies to, Cost, Code);
  • the cost tiers;
  • what happens when an effect doesn't compile;
  • projects from someone else;
  • the tools and the MCP resource, for agent authors.
• A link from AI editing and an Effect regions subsection in Editing & timeline.
• The 7 translations, using the app's own labels for the inspector. TRANSLATING.md lists the new doc.

Checks, locally (the Docs workflow only runs on PRs to main)

• npm run build: the 8 locales build, with no broken link or anchor.
• npm run typecheck, npm run i18n:check, npm run check:recreation: clean.

The translations were written in the same pass as the English. TRANSLATING.md asks for a full review of a new page in each language before it ships, which is when #1210 lands on main.

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