Add a manual refresh button to the Array section on System

Unraid's stats were already fetched live on every page load (no
server-side cache), so this doesn't bypass anything — it just lets the
section be re-fetched without a full page reload, for confirming it's
current without waiting on a reload.

Array section moves into its own partial (_array_section.html) so a new
/api/array/refresh route can re-render just that fragment and swap it
into #array-section, rather than duplicating the table/bar/disk-row
markup in JS.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LPJxtE9tPURsaWDZ6rC4Dt

app.py

@@ -1855,6 +1855,18 @@ def system_page():
                            ombi=r["ombi"], admin_unwatched=r["admin_unwatched"])
 
 
+@app.route("/api/array/refresh")
+@login_required
+def api_array_refresh():
+    """Re-renders just the Array section's markup for P105's refresh
+    button. Unraid's stats aren't cached (get_unraid_stats hits the
+    GraphQL API live on every call), so this is a plain re-fetch — the
+    button exists for the visitor's own peace of mind, not to bypass a
+    cache. Returns HTML, not JSON: swapped directly into #array-section
+    rather than re-implementing the table/bar/disk-row markup in JS."""
+    return render_template("_array_section.html", unraid=get_unraid_stats())
+
+
 @app.route("/activity")
 @login_required
 def activity_page():