[w3c/manifest] Bring back `beforeinstallprompt` (PR #1206)

Closes #???

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)
* [x] 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:

Bring back `beforeinstallprompt`

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/1206.html" title="Last updated on Feb 6, 2026, 8:17 AM UTC (37df10e)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1206/25f88f1...37df10e.html" title="Last updated on Feb 6, 2026, 8:17 AM UTC (37df10e)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1206

-- Commit Summary --

  * Bring back `beforeinstallprompt`

-- File Changes --

    M index.html (374)

-- Patch Links --

https://github.com/w3c/manifest/pull/1206.patch
https://github.com/w3c/manifest/pull/1206.diff

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