fix(nav,footer): drop orphan _hidden section header, show footer on Activate

Two follow-ups to the prior sidebar/footer cleanup:

- The "_hidden" section header was still visible in the sidebar
  because Streamlit renders ``stNavSectionHeader`` as a sibling of
  ``stNavSection``, not a child — so the ``:has()`` rule on the
  section was hiding the items list but leaving the header
  (and its collapse/drilldown marker) behind. Move Activate +
  Close into the unlabeled section (key ``""``) alongside Home so
  there is no header to leak in the first place, then hide just
  the two links via ``stSidebarNavLinkContainer:has(...)`` (with
  a defensive ``a[href$=...]`` fallback for browsers without
  ``:has()`` support).
- The sticky footer was missing on ``pages/_Activate.py`` because
  the page never called ``render_sticky_footer`` — added the
  call so the Help / Close bar persists when the user follows
  the popover's Activate / Manage link.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/gui/app.py

@@ -109,13 +109,16 @@ def _build_navigation() -> dict[str, list]:
         url_path="close",
     )
 
+    # Activate + Close are placed in the unlabeled section alongside
+    # Home (key ``""`` — Streamlit renders no header for it). The CSS
+    # in ``hide_streamlit_chrome`` then hides just their two links by
+    # ``href``, leaving Home visible and no orphan section header /
+    # drilldown marker in the sidebar.
     return {
-        "": [home],
+        "": [home, activate, close],
         section_label("cleaners"): by_section["cleaners"],
         section_label("transformations"): by_section["transformations"],
         section_label("automations"): by_section["automations"],
-        # Hidden section — see comment above + CSS in hide_streamlit_chrome.
-        "_hidden": [activate, close],
     }
 
 

src/gui/components/_legacy.py

@@ -60,29 +60,29 @@ header[data-testid="stHeader"] {
 footer {
     display: none !important;
 }
-/* Hide the Activate + Close entries from the sidebar nav — both
+/* Hide the Activate + Close entries from the sidebar nav. Both
    pages stay registered (so /activate and /close remain
    URL-routable) but are reached from the sticky-footer Help
-   popover instead of the sidebar. */
+   popover instead of the sidebar. They are grouped under the
+   unlabeled section alongside Home in ``app.py`` so hiding the
+   two links here leaves no orphan section header behind. We
+   target the LinkContainer (Streamlit's per-entry wrapper) so the
+   list item collapses, not just the inner anchor — otherwise the
+   container's spacing would still occupy a row. */
+[data-testid="stSidebarNav"] [data-testid="stSidebarNavLinkContainer"]:has(a[href$="/activate"]),
+[data-testid="stSidebarNav"] [data-testid="stSidebarNavLinkContainer"]:has(a[href$="/activate/"]),
+[data-testid="stSidebarNav"] [data-testid="stSidebarNavLinkContainer"]:has(a[href$="/close"]),
+[data-testid="stSidebarNav"] [data-testid="stSidebarNavLinkContainer"]:has(a[href$="/close/"]) {
+    display: none !important;
+}
+/* Defensive fallback for browsers without :has() support — at
+   least hide the anchor itself so the entry isn't clickable. */
 [data-testid="stSidebarNav"] a[href$="/activate"],
 [data-testid="stSidebarNav"] a[href$="/activate/"],
 [data-testid="stSidebarNav"] a[href$="/close"],
 [data-testid="stSidebarNav"] a[href$="/close/"] {
     display: none !important;
 }
-/* Hide the section header that wraps those entries so no orphan
-   label is left above the hidden links. Streamlit tags each nav
-   section with ``data-testid="stNavSection"``; the :has() selector
-   picks only the one(s) containing those links. Modern browsers
-   (Chrome 105+, Safari 15.4+, Firefox 121+) all support :has();
-   older browsers fall back to showing the section header, which
-   is visually harmless. */
-[data-testid="stSidebarNav"] [data-testid="stNavSection"]:has(a[href$="/activate"]),
-[data-testid="stSidebarNav"] [data-testid="stNavSection"]:has(a[href$="/activate/"]),
-[data-testid="stSidebarNav"] [data-testid="stNavSection"]:has(a[href$="/close"]),
-[data-testid="stSidebarNav"] [data-testid="stNavSection"]:has(a[href$="/close/"]) {
-    display: none !important;
-}
 /* Reclaim top padding lost from hidden header. Slim the bottom too —
    Streamlit's default leaves several rems below the last widget. */
 .stAppViewBlockContainer,

src/gui/pages/_Activate.py

@@ -19,7 +19,11 @@ _project_root = Path(__file__).resolve().parent.parent.parent.parent
 if str(_project_root) not in sys.path:
     sys.path.insert(0, str(_project_root))
 
-from src.gui.components import hide_streamlit_chrome, render_activation_form
+from src.gui.components import (
+    hide_streamlit_chrome,
+    render_activation_form,
+    render_sticky_footer,
+)
 from src.i18n import t
 
 st.set_page_config(
@@ -31,4 +35,5 @@ st.set_page_config(
 # ``gate_license=False`` keeps the chrome from re-rendering the
 # activation form on top of the form we're about to render below.
 hide_streamlit_chrome(gate_license=False)
+render_sticky_footer()
 render_activation_form(key_prefix="page")