[w3c/manifest] Rename "default display mode" to "applied display mode" (PR #1215)

Closes #1024

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

* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

editorial: rename "default display mode" to "applied display mode"

The term "default" implied a fallback, when it actually meant the display mode
currently in effect. This rename clarifies the three roles: the manifest's
`display` member declares the preferred display mode, the UA determines the
applied display mode (via the fallback chain and user/UA overrides), and the
`display-mode` media feature reflects the applied one.

Also fixes the `[=applies=]` cross-reference so the subject is the manifest
(matching the dfn at #applying), and corrects the security override example
from "another origin" to "out of scope" for consistency with the rest of the
spec.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1215.html" title="Last updated on Apr 10, 2026, 7:21 AM UTC (6eec338)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1215/c5b38d2...6eec338.html" title="Last updated on Apr 10, 2026, 7:21 AM UTC (6eec338)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1215

-- Commit Summary --

  * Rename "default display mode" to "applied display mode"

-- File Changes --

    M index.html (24)

-- Patch Links --

https://github.com/w3c/manifest/pull/1215.patchhttps://github.com/w3c/manifest/pull/1215.diff
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