{#
Burndown chart (#206). Expects a `snapshots` variable — a list of dicts
with keys: snapshot_date, todo, doing, review, done. If fewer than 2
snapshots, shows a placeholder message. Otherwise renders an SVG polyline
of "remaining" (todo+doing+review) over time.
Also expects `color` for the line stroke.
#}
{% if snapshots and snapshots | length >= 2 %}
{% set w = 200 %}
{% set h = 60 %}
{% set pad = 2 %}
{% set n = snapshots | length %}
{# Compute remaining (non-done) for each snapshot #}
{% set remaining = [] %}
{% for s in snapshots %}
{% set _ = remaining.append(s.todo + s.doing + s.review) %}
{% endfor %}
{% set mx = [remaining | max, 1] | max %}
{# Build SVG polyline points #}
{% set points = [] %}
{% for r in remaining %}
{% set x = pad + (loop.index0 / (n - 1)) * (w - 2 * pad) %}
{% set y = pad + ((mx - r) / mx) * (h - 2 * pad) %}
{% set _ = points.append("%.1f,%.1f" | format(x, y)) %}
{% endfor %}
{# Filled area: polyline + close along the bottom #}
{% set area_points = points | join(" ") + " %.1f,%.1f %.1f,%.1f" | format(w - pad, h - pad, pad, h - pad) %}
{% else %}