[w3c/manifest] Redefine application context on top-level traversable (PR #1219)

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: redefine application context on top-level traversable

Modernises the manifest lifecycle terminology to match HTML's current
navigable model. The spec previously anchored `application context` on
`top-level browsing context`; that term is still defined in HTML but the
canonical concept post-navigable-refactor is `top-level traversable`.

Specifically:

- The `apply` definition now applies a processed manifest to a
  `[=top-level traversable=]` (was: top-level browsing context).
- The `application context` definition is now "A top-level traversable
  that has a manifest applied to it".
- A new `unapply` dfn introduces the cease transition for application
  contexts. Previously the lifecycle had a "becomes" edge with no
  corresponding "ceases" — now both directions are spelled out.
- The `create a new application context` algorithm is simplified to
  return the traversable directly, rather than deriving an active
  browsing context from it.
- All other references throughout the spec are migrated.

No observable behavior change. Anchor IDs preserved (#applying,
#application-context, #installed-web-application).

Surfaced during review of PR #1218 (the \`installed\` CSS media feature),
which uses navigable terms. With this PR landed, the two specs agree on
terminology end-to-end.


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1219

-- Commit Summary --

  * redefine application context on top-level traversable

-- File Changes --

    M index.html (116)

-- Patch Links --

https://github.com/w3c/manifest/pull/1219.patch
https://github.com/w3c/manifest/pull/1219.diff

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