fix(test): close the test-entry leak into real trip content

A ui-test entry had survived into the active trip's dailies. Three independent
failures had to line up for that, and all three were real:

1. cleanupEntry() used host-side fs.rmSync. Grav's Apache workers run as root,
   so every entry the form creates is root-owned and recursive removal needs
   write permission on that directory — which the host user lacks. Cleanup had
   never worked for form-created entries; it just threw inside a path nothing
   checked. It now falls back to `docker exec … rm -rf` in the container that
   actually serves USER_DIR.

2. globalTeardown's dailies sweep keyed off a `parent:` in post-form.md — a key
   deliberately removed (the write target comes from site.yaml active_trip, and
   CLAUDE.md forbids re-adding a static parent). The regex could never match, so
   dailiesDir was always null and the sweep silently did nothing. It now reuses
   helpers' own resolution instead of keeping a divergent copy.

3. Nothing pinned the suite to this checkout's server. playwright.config.js
   defaults to :8081, so a worktree run hit the MAIN checkout — entries created
   in one content tree while the specs asserted and cleaned up in another.
   test-ui now passes GRAV_BASE_URL from GRAV_PORT, and globalSetup hard-fails
   when the server's bind mount disagrees with the tree the specs read.

Also fixed, found on the way to a green run:

- test-account interpolated the password into an `sh -c` string, so a password
  containing a shell metacharacter was re-parsed by the container's shell
  (`sh: 2: <fragment>: not found`, no account, every UI run dead). It now
  travels via `docker exec -e`, making the recipe indifferent to its contents.
- `make start` in a worktree always failed: travel-memories declares
  `env_file: .env` and worktree-new creates none. It degrades to start-grav
  there — a worktree with no server is what sent runs to :8081 in the first
  place.
- test-form-config asserted a hero_image field that 8cf1145 deliberately
  removed; it had been failing ever since.

Verified: config 22/22, post 6/6, location-override 20/20, and a full UI run
now leaves zero ui-test entries behind. The remaining UI failures are
pre-existing on main — site.yaml pins owner_username to a real account while
the suite logs in as testrunner, so owner-only controls never render for it.
Only trip-publish.spec.js patches that; delete-flow, edit-mode and anon-view
do not. Left for a separate branch.

tests/ui/helpers.js

@@ -170,6 +170,60 @@ async function createPhotoEntry(page, tag, { content, publish = true, created }
         'Entry posted successfully!', { timeout: 15_000 });
 }
 
+/**
+ * Resolve the Grav container that serves USER_DIR, so cleanup can delete as root.
+ * Prefers GRAV_CONTAINER (set by .worktree-env / .env), else matches on the bind
+ * mount so a worktree never picks the main checkout's container.
+ */
+function resolveGravContainer() {
+    if (process.env.GRAV_CONTAINER) return process.env.GRAV_CONTAINER;
+    try {
+        const want = fs.realpathSync(USER_DIR);
+        const names = execSync("docker ps --format '{{.Names}}'", { encoding: 'utf-8', stdio: ['pipe', 'pipe', 'ignore'] })
+            .split('\n').filter(Boolean);
+        return names.find((n) => {
+            const src = execSync(
+                `docker inspect ${n} --format '{{range .Mounts}}{{if eq .Destination "/var/www/html/user"}}{{.Source}}{{end}}{{end}}'`,
+                { encoding: 'utf-8', stdio: ['pipe', 'pipe', 'ignore'] }
+            ).trim();
+            return src && fs.realpathSync(src) === want;
+        }) || null;
+    } catch (_) {
+        return null;
+    }
+}
+
+/**
+ * Delete an entry directory, falling back to the container when the host cannot.
+ *
+ * Grav's Apache workers run as root, so every entry the form creates is
+ * root-owned. Removing one recursively needs write permission on that directory,
+ * which the host user does not have — so a plain fs.rmSync throws EACCES and the
+ * entry survives. That is how a ui-test entry ended up committed-adjacent in the
+ * active trip's content on 2026-07-24: cleanup had never actually worked for
+ * form-created entries, it just failed inside a path nothing checked.
+ *
+ * `docker exec … rm -rf` runs as root in the container, which can remove them.
+ */
+function removeEntryDir(dir) {
+    try {
+        fs.rmSync(dir, { recursive: true });
+        return true;
+    } catch (err) {
+        if (err.code !== 'EACCES' && err.code !== 'EPERM') throw err;
+    }
+    const container = resolveGravContainer();
+    if (!container) {
+        throw new Error(
+            `Cannot remove ${dir}: it is root-owned (written by Grav in the container) and no ` +
+            `matching container was found to delete it as root. Set GRAV_CONTAINER or remove it manually.`
+        );
+    }
+    execSync(`docker exec ${container} rm -rf '/var/www/html/user/${path.relative(USER_DIR, dir)}'`,
+        { stdio: ['pipe', 'pipe', 'pipe'] });
+    return true;
+}
+
 /**
  * Find a tracker entry folder by a unique slug fragment, then delete it.
  */
@@ -179,7 +233,7 @@ function cleanupEntry(slugFragment) {
     const entries = fs.readdirSync(TRACKER_DIR);
     const match = entries.find(e => e.includes(slugFragment));
     if (match) {
-        fs.rmSync(path.join(TRACKER_DIR, match), { recursive: true });
+        removeEntryDir(path.join(TRACKER_DIR, match));
     }
 }
 
@@ -202,4 +256,7 @@ function readEntryMd(entryDir) {
     return fs.readFileSync(path.join(entryDir, name), 'utf-8');
 }
 
-module.exports = { fillEditor, waitForPhotoUpload, postEntry, createPhotoEntry, cleanupEntry, findEntry, readEntryMd, TEST_PHOTO, TRACKER_DIR, ACTIVE_TRIP_URL };
+// USER_DIR is exported so global-setup/global-teardown resolve the same tree the
+// specs assert against, instead of keeping their own (previously divergent) copy
+// of this logic.
+module.exports = { fillEditor, waitForPhotoUpload, postEntry, createPhotoEntry, cleanupEntry, removeEntryDir, findEntry, readEntryMd, TEST_PHOTO, USER_DIR, TRACKER_DIR, ACTIVE_TRIP_URL };