{#
Shared left menu — the ONE complete sidebar rendered by every WebUI tab.
The chat page and the Usage / Tasks / Goals / Agent Monitor / Topics pages
include this exact component. Page headers import menu_button() for the mobile
opener; static/nav.js supplies navigation-only behaviour on non-chat pages,
The menu's expanded/collapsed state persists across page navigation on desktop in each tab;
on mobile or narrow viewports (<=768px), the menu collapses on navigation to keep page content clear.
Jinja context:
active — 'chat'|'usage'|'tasks'|'goals'|'agents'|'topics'|'decision'
#}
{% macro menu_button() -%}
{%- endmacro %}