[w3c/manifest] Add `color_scheme_dark` member and themeable members (PR #1205)

Closes #975

This change (choose at least one, delete ones that don't apply):

* Adds new normative requirements

Implementation commitment (delete if not making normative changes):

* [ ] WebKit (https://bugs.webkit.org)
* [ ] Chromium (https://bugs.chromium.org/)
* [ ] Gecko (http://bugzilla.mozilla.org)

If change is normative, and it adds or changes a member:

* [ ] [updated JSON schema](https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/web-manifest.json)

Commit message:

Add `color_scheme_dark` member and themeable members

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* chore:
* editorial:
* BREAKING CHANGE:
* And use none if it's a normative change


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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1205.html" title="Last updated on Jan 29, 2026, 6:06 PM UTC (55ea5f2)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1205/25f88f1...55ea5f2.html" title="Last updated on Jan 29, 2026, 6:06 PM UTC (55ea5f2)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1205

-- Commit Summary --

  * Add `color_scheme_dark` member and themeable members

-- File Changes --

    M index.html (153)

-- Patch Links --

https://github.com/w3c/manifest/pull/1205.patch
https://github.com/w3c/manifest/pull/1205.diff

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