chore(post-images): Bump satori to 0.25.0 (#125)

[bbornino]

Closes #125.

Summary

Bumps satori from 0.13.2 to 0.25.0 in packages/post-images.

Investigation

#125 describes the blurred code snippet in the banner background
(packages/post-images/src/layouts/banner.ts's code() function,
two stacked <pre> tags with filter: blur(1px)) going blank after
upgrading satori — with before/after screenshots on the issue.

I could not reproduce that regression against this repo:

• Diffed satori's source directly between 0.13.2 and 0.25.0 across
  handler/presets.ts, text/processor.ts, builder/text.ts,
  handler/compute.ts, and text/index.ts (the files that own
  <pre> defaults, white-space handling, and glyph/path rendering).
  Nothing in that range touches whitespace collapsing or pre text
  rendering in a way that would blank it out — the real changes are
  Yoga API updates (box-sizing, position: static/contents), text-decoration
  (skip-ink, double lines), text-indent, and a word-wrap tweak unrelated
  to pre.
• With satori bumped to 0.25.0 locally, the existing banner.test.ts
  and link-preview.test.ts snapshot tests pass unmodified against
  their existing golden PNGs (generated on 0.13.2).
• Manually rendered the banner with both the existing mock post data
  and a longer, realistic multi-line TypeScript/JSX code sample (to
  stress wrapping/overflow) — code renders fully and correctly in
  both cases.
• tsc --noEmit is clean with the new satori types.

No other code changes were needed in banner.ts or index.ts's
satori() call — grepped the rest of the monorepo and packages/post-images
is the only place satori is referenced or version-pinned.

Open question: since the issue's screenshots show a real blank
render, it's possible the bug was already fixed in an intermediate
satori release between 0.13.2 and 0.25.0, or that it depended on
post content/environment specifics not present in our test fixtures.
Flagging this rather than closing it as unreproducible outright —
worth a second pair of eyes/screenshots if it resurfaces.

Changes

• packages/post-images/package.json — satori 0.13.2 → 0.25.0
• pnpm-lock.yaml — updated accordingly
• packages/post-images/tests/banner.test.ts — new regression test
  rendering longer, multi-line code (imports, JSX, multi-line functions)
  through the banner layout, checked against a new golden
  tests/banner-long-code.png, generated from the current (0.25.0)
  output and confirmed correct by eye. Gives permanent coverage for
  this bug shape rather than a one-off manual check.

Test plan

• pnpm test:unit (lint, knip, publint, sherif, vitest across all
  NX projects) — clean
• pnpm run build:all — clean
• pnpm run prettier — clean (only pre-existing warning on
  .claude/settings.local.json, unrelated to this change)
• Manually inspected banner-long-code.png and the existing
  banner.png/link-preview.png renders by eye

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