[08abhinav]

Description

decodeEntities() in src/lib/meta-fetcher.ts only knew ten named entities, so common ones like ’, —, …, é and © reached the preview checker as raw text. That inflated title lengths (a 59-character title was reported as 71 chars), showed ’ and — on every platform card, made the Google preview cut titles too early, and passed raw entities to Smart Autofill.

This PR:

• Adds src/lib/html-entities.ts with the 252 HTML 4 named entities (Latin-1, symbol and special sets), with characters taken from the current WHATWG list (⟨ and ⟩ are U+27E8 and U+27E9). apos and the four uppercase names (AMP, LT, GT, QUOT) are kept.
• Replaces the NAMED_ENTITIES table in meta-fetcher.ts with that import, keeping the case-sensitive exact lookup and the Object.hasOwn check from fix(meta-fetcher): ignore Object prototype properties when decoding named entities #391.
• Changes the name pattern from [a-z]+ to [a-z][a-z0-9]* so names with digits (½, ²) decode. The numeric entity branch is unchanged.
• Unknown names, wrong-case names (&Amp;,  ) and prototype names (&constructor;) are still left as they are.

Closes #396

How I Tested This

• Added tests in tests/lib/meta-fetcher.test.ts:
  • the issue's example title now decodes to Don’t ship on Fridays — notes from 200 releases | Acme Blog and analyzeMeta() no longer reports a title-length warning
  • typographic, accented, symbol and digit-containing entities (…, é, É, ©, ™, €, ½, ², ⟨, ⟩) in attribute values
  • every entry in the table decodes in both <title> and a <meta> attribute value
  • the table has 257 entries (252 HTML 4 names + apos + 4 uppercase)
  • case-sensitivity (É and &Frac12; stay raw)
• Confirmed the new tests fail on the old code (stashed my meta-fetcher.ts change) and pass with the fix.
• Compared every name and character in html-entities.ts against https://html.spec.whatwg.org/entities.json with a temporary script (not committed). <result: e.g. "no mismatches">
• Before the fix, the issue's parseMetaTags example returned Don’t ship on Fridays — notes from 200 releases | Acme Blog. After, it returns Don’t ship on Fridays — notes from 200 releases | Acme Blog.
• Ran npm run check, npm run test and npm run build: <paste result, e.g. "all pass">

AI Assistance

Claude helped me with a first draft of html-entities.ts and the tests, and debugging. I reviewed the code, verified the entity table against the WHATWG entities.json, and ran the tests and checks myself.

Type of Change

• Bug fix
• New template
• New feature
• Documentation
• Tests
• Refactoring
• Performance improvement
• Other (describe below)

Checklist

• This PR targets dev
• I was assigned the linked issue
• npm run check passes
• npm run test passes
• For a bug fix: the new test fails without my change
• Tested locally with npm run dev
• Screenshots included for visual changes
• New templates follow the Template Guidelines