fix: minor rendering diffs (trailing space, em-dash, entities, labels) (~47 en pages)

[jp-knj]

Problem

Collection of minor cosmetic differences affecting ~47 en pages:

• Trailing space stripped: import { \n → import {\n (before newline)
• Em-dash spacing: ". —" vs ".—" (smartypants inconsistency)
• HTML entities: <strong> rendered literally vs <strong>
• Extra "external" label: link text includes "external" suffix
• <style></style> literal: tag names rendered as literal text

Affected: ~47 en pages × 14 locales ≈ 658 pages total

Priority

Low — cosmetic issues that don't significantly impact readability.