Initialize sparklines to start at zero

Bump version to 0.2.6

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "textual-webterm"
-version = "0.2.5"
+version = "0.2.6"
 description = "Serve terminal sessions over the web"
 authors = ["Will McGugan <will@textualize.io>"]
 license = "MIT"

src/textual_webterm/docker_stats.py

@@ -325,6 +325,9 @@ def render_sparkline_svg(
         # Empty placeholder
         return f'<svg width="{width}" height="{height}" xmlns="http://www.w3.org/2000/svg"></svg>'
 
+    # Prepend zero to start sparkline from baseline
+    values = [0.0, *values]
+
     # Normalize values to 0-1 range
     max_val = max(values) if max(values) > 0 else 1
     normalized = [v / max_val for v in values]