fix(trips): remaining publish-toggle review findings

- resolveTripChild now asserts the resolved page uses the trip template, so a
  non-trip direct child of /trips could never be toggled through this endpoint
  (P3 adversarial).
- apiSend gains an optional timeoutMs (AbortController); trip-publish passes 10s
  so a hung toggle can't leave the switch stuck aria-busy. post-form omits it,
  keeping media uploads unbounded (P2 reliability).
- trips.html.twig reuses trip.html.twig's one-line active-trip slug match
  instead of a bespoke 3-branch OR (P2 maintainability).
- Draft-badge amber is now a --color-draft-accent token shared by the trip and
  journal badges instead of a twice-hardcoded #E0A458 literal (P3).

Rebuilt js/trip-publish.js and js/post/post-form.js (shared api-utils change).
PHP lint clean; trip-publish suite 10/10; post suite unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Mpdu3Dt1iVoozHwAMyjrbn

plugins/cache-on-save/classes/EntryScopeGuard.php

@@ -152,6 +152,12 @@ class EntryScopeGuard
      */
     public static function resolveTripChild(Grav $grav, string $slug): ?PageInterface
     {
-        return self::resolveChildOf($grav, '/trips', $slug);
+        $page = self::resolveChildOf($grav, '/trips', $slug);
+        // Only actual trip pages are publishable — a non-trip page ever added as a
+        // direct child of /trips must not be toggled through this endpoint.
+        if ($page === null || $page->template() !== 'trip') {
+            return null;
+        }
+        return $page;
     }
 }