Sortify 4.8.4: fix WebUI Action launch and long Sort now apply

[Lycidias93]

Root causes

1. The module-manager Action launcher could return after handing the bootstrap URL to Android, allowing launcher-shell teardown to kill the standalone loopback server before the external browser reached 127.0.0.1.
2. Productive Sort now ran through the synchronous base action HTTP request. Real sorting can take minutes, while the shared server's HTTP/action path is intentionally bounded, so the browser can surface a network error while Sortify continues working.

Fix

• bump Sortify to 4.8.4-webui-action-launch-hotfix / versionCode 31;
• pin shared WebUI Core 0.6.3 at 6791a05be79f162979c76a286f7cdbdd9ce1cc6b;
• inherit the Core 0.6.2+ SIGHUP-safe Action launcher;
• keep Sort now Preview synchronous/read-only;
• declare apply_job=sort-now and route productive Sort now through the bounded background Jobs lifecycle;
• reject direct synchronous productive Sort-now adapter execution;
• keep SDD policy v4115, persistent config and existing safety boundaries unchanged;
• update source verification, release notes, changelog and build provenance.

Release state

This PR is a source candidate only. Stable update metadata remains on 4.8.3 until the exact installed ZIP passes the required WebUI release audit, including module-manager Action-button bootstrap and productive Sort-now background-job device acceptance.

Risk: low/medium. The transport/lifecycle changes are bounded and reversible; productive file sorting semantics are unchanged.
Rollback: revert this PR and remain on stable 4.8.3 / Core 0.6.1.