Fix review issues in 2026-03-09 propositions articles (14 languages)

[Copilot]

Addresses all automated code review feedback on the 14-language government propositions articles: CSP hardening, broken script reference, Schema.org/OG metadata conflict, misleading link text, and accessibility gaps.

Changes

• CSP hardened (all 14 files): Removed 'unsafe-inline' from script-src and style-src; replaced with a SHA-256 hash for the inline theme-detection script — the only inline script in these files

  <!-- Before -->
  script-src 'self' 'unsafe-inline' https:; style-src 'self' 'unsafe-inline' ...
  <!-- After -->
  script-src 'self' 'sha256-5kywaWmasx2qskEerW3kpgep0X5UZtjznuqQqlCSsG8=' https:; style-src 'self' ...

• Script reference fixed (all 14 files): ../scripts/back-to-top.ts → ../js/back-to-top.js (the compiled output that actually exists and can be executed by browsers)

• Schema.org image dimensions corrected (all 14 files): og-image-news.webp JSON-LD dimensions were 512×512, conflicting with OG metadata; corrected to 1200×630. Publisher logo stays at 512×512.

• Proposition link text normalized (all 14 files): Link labels used internal document IDs (Prop. 2025/26: HD03134) instead of the standard proposition number format used everywhere else in the article body (Prop. 2025/26:134)

• Skip-link localization (13 non-English files): "Skip to main content" translated to each document's language (e.g. 跳至主要内容 for zh, الانتقال إلى المحتوى الرئيسي for ar)

• Dutch file lang="en" annotations (nl.html): English-language paragraphs throughout the Dutch article (context-box, deep-analysis, all "Why It Matters" / "Published:" entries) now carry lang="en" so screen readers and search engines do not mispronounce or mis-index them

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