fix(tests): fix all 10 e2e test failures

- test_planner_calculate_htmx: click capex tab to reveal #tab-content
  (it starts display:none and only shows after tab switch)
- test_planner_quote_sidebar_visible_wide: use browser.new_page() instead
  of page.context.new_page() (default contexts don't support new_page)
- test_login/signup/quote_step1_loads: add .first to avoid strict mode
  violation from the feedback popover form
- test_language_switcher_en_to_de: verify footer link href + navigate
  directly instead of click (avoids off-screen element timing issues)
- test_landing_nav_no_overlap: filter display:none elements (zero-width
  bounding rect) so mobile-only nav div doesn't skew overlap check
- test_quote_wizard_*: replace schema.sql (doesn't exist) with migrate()
  approach matching test_visual.py and test_e2e_flows.py; fix URL from
  /leads/quote to /en/leads/quote; use label click for display:none pill
  radios; add missing required fields for steps 6 (financing_status +
  decision_process) and 8 (services_needed); add contact_phone to step 9

All 1018 unit tests + 61 e2e tests now pass.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/tests/test_visual.py

@@ -202,16 +202,18 @@ def test_landing_nav_no_overlap(live_server, page):
     page.goto(live_server)
     page.wait_for_load_state("networkidle")
 
-    # Get bounding boxes of direct children in the nav's right-side flex container
+    # Get bounding boxes of visible direct children in the nav inner div
     boxes = page.evaluate("""
         (() => {
             const navDiv = document.querySelector('nav > div');
             if (!navDiv) return [];
             const items = navDiv.children;
-            return Array.from(items).map(el => {
-                const r = el.getBoundingClientRect();
-                return {top: r.top, bottom: r.bottom, left: r.left, right: r.right};
-            });
+            return Array.from(items)
+                .map(el => {
+                    const r = el.getBoundingClientRect();
+                    return {top: r.top, bottom: r.bottom, left: r.left, right: r.right, width: r.width};
+                })
+                .filter(r => r.width > 0);  // skip display:none / hidden elements
         })()
     """)
     # Check no horizontal overlap between consecutive items