test(web): smoke tests + static-analysis audits for the web UI

Guardrails so this branch's fix classes can't regress silently:

- test_web_smoke.py (24 tests): boots the pages blueprint with the same
  dual registration app.py uses and asserts every page/partial returns 200
  with its load-bearing markers (nav wiring, getting-started card, advanced
  section, rotation order card, per-mode duration inputs), the /v3 legacy
  alias serves everything, all critical static assets (incl. vendored
  fontawesome/codemirror, PWA manifest/icons) are served, durations group
  per plugin with the leftover bucket, and the advanced-hardware section
  really contains the tuning fields. Would have caught this session's
  unreachable-durations-page and orphaned-tab bugs instantly.
- test_web_static_audit.py (3 tests): (1) every responsive utility class
  referenced in templates is actually defined in app.css - the
  silently-no-op class bug that left the header search box invisible at
  every width; (2) every url_for('static', ...) reference points to a real
  file; (3) any JS file calling the debugLog global declares it in a
  /* global */ header.

All 40 web tests pass (24 + 3 new, 13 existing) under pytest + Flask.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KEZK1P1Q1fu5pcuVrkrCFZ

test/test_web_static_audit.py

@@ -0,0 +1,85 @@
+"""
+Static-analysis audits for the web UI, as tests so CI enforces them.
+
+1. Breakpoint utility audit: app.css hand-maintains a Tailwind-style utility
+   subset, so a template can reference a responsive class (e.g. sm:block)
+   that no CSS rule defines — it silently no-ops. This once left the header
+   search box and system stats invisible at every screen width. The audit
+   diffs classes used in templates against classes defined in app.css.
+
+2. Asset reference audit: every url_for('static', filename=...) in the
+   templates must point to a file that exists, so a renamed/moved asset
+   can't ship as a broken <script>/<link>/<img>.
+
+3. debugLog globals audit: any static JS file calling debugLog() (a global
+   defined in base.html) must declare it in a /* global */ header so linting
+   stays clean and the dependency is explicit.
+"""
+
+import re
+from pathlib import Path
+
+PROJECT_ROOT = Path(__file__).parent.parent
+WEB = PROJECT_ROOT / "web_interface"
+TEMPLATES = WEB / "templates"
+STATIC = WEB / "static"
+APP_CSS = STATIC / "v3" / "app.css"
+
+BP_PREFIXES = ("sm", "md", "lg", "xl", "2xl")
+
+
+def _template_files():
+    return sorted(TEMPLATES.rglob("*.html"))
+
+
+def test_every_used_breakpoint_class_is_defined():
+    used = set()
+    class_attr = re.compile(r'class="([^"]*)"')
+    bp_class = re.compile(r"\b(%s):[A-Za-z0-9_.-]+" % "|".join(BP_PREFIXES))
+    for path in _template_files():
+        for attr in class_attr.findall(path.read_text()):
+            for m in bp_class.finditer(attr):
+                used.add(m.group(0))
+
+    css = APP_CSS.read_text()
+    defined = {
+        m.group(0).lstrip(".").replace("\\:", ":")
+        for m in re.finditer(
+            r"\.(%s)\\:[A-Za-z0-9_-]+" % "|".join(BP_PREFIXES), css
+        )
+    }
+
+    missing = sorted(used - defined)
+    assert not missing, (
+        "Responsive utility classes referenced in templates but never defined "
+        f"in app.css (they silently no-op): {missing}"
+    )
+
+
+def test_every_static_url_for_points_to_a_real_file():
+    ref = re.compile(
+        r"url_for\(\s*['\"]static['\"]\s*,\s*filename\s*=\s*['\"]([^'\"]+)['\"]"
+    )
+    missing = []
+    for path in _template_files():
+        for filename in ref.findall(path.read_text()):
+            if not (STATIC / filename).is_file():
+                missing.append(f"{path.relative_to(PROJECT_ROOT)}: {filename}")
+    assert not missing, f"Templates reference missing static assets: {missing}"
+
+
+def test_js_files_calling_debuglog_declare_the_global():
+    undeclared = []
+    for path in sorted((STATIC / "v3").rglob("*.js")):
+        if "vendor" in path.parts:
+            continue
+        text = path.read_text()
+        # Calls debugLog( but neither defines it nor declares the global
+        calls = re.search(r"(?<![.\w])debugLog\(", text)
+        defines = "window.debugLog" in text
+        declares = re.search(r"/\*\s*global[^*]*\bdebugLog\b", text)
+        if calls and not defines and not declares:
+            undeclared.append(str(path.relative_to(PROJECT_ROOT)))
+    assert not undeclared, (
+        f"JS files call debugLog() without a /* global debugLog */ header: {undeclared}"
+    )