fix: prevent Vue-nav reload loop when running without Caddy proxy

sync_ui_cookie() was calling window.parent.location.reload() on every
render when user.yaml has ui_preference=vue, but no Caddy is in the
traffic path (test instances, bare Docker). This caused an infinite
reload loop because the reload just came back to Streamlit.

Gate the reload on PEREGRINE_CADDY_PROXY=1. Without it, the cookie is
still written silently but no reload is attempted. Add the env var to
compose.yml and compose.cloud.yml (both are behind Caddy); omit from
compose.test-cfcore.yml so test instances stay stable.

app/components/ui_switcher.py

@@ -32,6 +32,13 @@ _DEMO_MODE = os.environ.get("DEMO_MODE", "").lower() in ("1", "true", "yes")
 # Example: PEREGRINE_VUE_URL=http://localhost:8506
 _VUE_URL = os.environ.get("PEREGRINE_VUE_URL", "").strip().rstrip("/")
 
+# When True, a window.location.reload() after setting prgn_ui=vue will be
+# intercepted by Caddy and routed to the Vue SPA. When False (no Caddy in the
+# traffic path — e.g. test instances, direct Docker exposure), reloading just
+# comes back to Streamlit and creates an infinite loop. Only set this in
+# production/staging compose files where Caddy is actually in front.
+_CADDY_PROXY = os.environ.get("PEREGRINE_CADDY_PROXY", "").lower() in ("1", "true", "yes")
+
 _COOKIE_JS = """
 <script>
 (function() {{
@@ -50,14 +57,18 @@ def _set_cookie_js(value: str, navigate: bool = False) -> None:
     port. Without this, reload() just sends the request back to the same
     Streamlit port with no router in between to inspect the cookie.
 
-    When PEREGRINE_VUE_URL is absent (Caddy deployment): navigate=True
+    When PEREGRINE_CADDY_PROXY is set (production/staging): navigate=True
     triggers window.location.reload() so Caddy sees the updated cookie on
     the next HTTP request and routes accordingly.
+
+    When neither is set (test instances, bare Docker): navigate is suppressed
+    entirely — the cookie is written silently, but no reload is attempted.
+    Reloading without a proxy just bounces back to Streamlit and loops.
     """
     # components.html() renders in an iframe — window.parent navigates the host page
     if navigate and value == "vue" and _VUE_URL:
         nav_js = f"window.parent.location.href = '{_VUE_URL}';"
-    elif navigate:
+    elif navigate and _CADDY_PROXY:
         nav_js = "window.parent.location.reload();"
     else:
         nav_js = ""

compose.cloud.yml

@@ -31,6 +31,7 @@ services:
       - DOCS_DIR=/tmp/cloud-docs
       - STREAMLIT_SERVER_BASE_URL_PATH=peregrine
       - PYTHONUNBUFFERED=1
+      - PEREGRINE_CADDY_PROXY=1
       - DEMO_MODE=false
     depends_on:
       searxng:

compose.test-cfcore.yml

@@ -21,7 +21,7 @@ services:
     ports:
       - "8516:8501"
     volumes:
-      - peregrine-test-data:/devl/job-seeker
+      - /devl/job-seeker:/devl/job-seeker
     environment:
       - STAGING_DB=/devl/job-seeker/staging.db
       - PYTHONUNBUFFERED=1
@@ -29,6 +29,3 @@ services:
     extra_hosts:
       - "host.docker.internal:host-gateway"
     restart: "no"
-
-volumes:
-  peregrine-test-data:

compose.yml

@@ -33,6 +33,7 @@ services:
       - FORGEJO_API_URL=${FORGEJO_API_URL:-}
       - PYTHONUNBUFFERED=1
       - PYTHONLOGGING=WARNING
+      - PEREGRINE_CADDY_PROXY=1
     depends_on:
       searxng:
         condition: service_healthy