fix(web): repair array-table.js syntax error and version static assets (#357)

Two issues left the v3 web UI's Overview (and other Alpine-driven tabs)
blank:

1. array-table.js had two safeSetHTML(target, `...`) calls that closed the
   template-literal argument with `; instead of `); — a SyntaxError that
   aborts the script and halts widget registration / Alpine initialization.

2. Static assets are served `Cache-Control: public, max-age=31536000,
   immutable` but were referenced without a cache-busting version (the header
   comment assumed "versioning via query params", which was only ever applied
   by hand to app.css). So edited JS/CSS never reached browsers — including
   fix #1.

Add a Flask url_defaults hook that appends each static file's mtime as a ?v=
param to every url_for('static', ...), so changed files get a new URL and are
refetched while unchanged files keep the long immutable cache. Drop the now
redundant manual ?v= on app.css.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

web_interface/app.py

@@ -391,6 +391,22 @@ def captive_portal_redirect():
     # Redirect to lightweight captive portal setup page (not the full UI)
     return redirect(url_for('pages_v3.captive_setup'), code=302)
 
+# Append a content-version query param (file mtime) to every static URL so the
+# long-lived `immutable` cache (see add_security_headers below) is actually safe:
+# when a static file changes its URL changes, so browsers refetch it. Without
+# this, edited JS/CSS were served immutable under an unchanging URL and never
+# reached clients until a manual cache clear.
+@app.url_defaults
+def add_static_version(endpoint, values):
+    if endpoint == 'static' and values.get('filename'):
+        try:
+            file_path = os.path.join(app.static_folder, values['filename'])
+            values['v'] = int(os.path.getmtime(file_path))
+        except OSError:
+            # File missing (e.g. plugin asset not yet installed) — skip versioning.
+            pass
+
+
 # Add security headers and caching to all responses
 @app.after_request
 def add_security_headers(response):