{#
Shared left menu — the ONE complete sidebar rendered by every WebUI tab.
The chat page and the 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,
while the chat application supplies its richer in-place session behaviour.
Jinja context:
active — 'chat'|'tasks'|'goals'|'agents'|'topics'
#}
{% macro menu_button() -%}
{%- endmacro %}