fix(viewer): drop meaningless '0' label on compare level bars

kaievolve/viewer/server.py

@@ -610,7 +610,11 @@ def compare_page():
                         "delta": f"{delta:.4f}" if abs(delta) > 1e-9 else "best",
                         "delta_cls": dcls,
                         "level": svg.hbar(
-                            a.best_mean - lo + 1e-9, (hi - lo) + 1e-9, width=150, height=14
+                            a.best_mean - lo + 1e-9,
+                            (hi - lo) + 1e-9,
+                            width=150,
+                            height=14,
+                            show_label=False,  # gap is already shown in the 'vs best' column
                         ),
                         "spark": (
                             svg.sparkline(curves[a.label], lo=clo, hi=chi)

kaievolve/viewer/svg.py

@@ -236,21 +236,31 @@ def effect_bar(delta: float, scale: float, width: int = 200, height: int = 20) -
 # ─── horizontal bar (model usage etc.) ───────────────────────────────────────
 
 
-def hbar(value: float, max_value: float, width: int = 180, height: int = 16) -> str:
-    """A plain left-anchored bar with the count at its end. For 'AI models used'
-    and similar small categorical breakdowns."""
+def hbar(
+    value: float, max_value: float, width: int = 180, height: int = 16, show_label: bool = True
+) -> str:
+    """A plain left-anchored bar. With ``show_label`` (the default) the integer
+    ``value`` is printed at the bar's end - for count breakdowns like 'AI models
+    used'. Set ``show_label=False`` when the bar encodes a continuous magnitude
+    (e.g. a score gap) whose exact value already lives in an adjacent column;
+    an ``int()`` count label would otherwise read as a meaningless '0'."""
     if max_value <= 0:
         return _empty(width, height)
     frac = max(0.0, min(1.0, value / max_value))
-    w = frac * (width - 34)
+    pad = 34 if show_label else 4
+    w = frac * (width - pad)
     y = height * 0.5
+    label = (
+        f'<text x="{_f(w + 5)}" y="{_f(y + 3.5)}" font-size="10" fill="{MUTED}">{int(value)}</text>'
+        if show_label
+        else ""
+    )
     return (
         f'<svg width="{width}" height="{height}" viewBox="0 0 {width} {height}" '
         f'font-family="ui-sans-serif,system-ui,sans-serif">'
         f'<rect x="0" y="{_f(y - 4)}" width="{_f(w)}" height="8" '
         f'fill="{ACCENT}" rx="1"/>'
-        f'<text x="{_f(w + 5)}" y="{_f(y + 3.5)}" font-size="10" '
-        f'fill="{MUTED}">{int(value)}</text>'
+        f"{label}"
         f"</svg>"
     )
 

tests/test_viewer.py

@@ -32,6 +32,13 @@ def test_charts_well_formed(self):
         self._well_formed(svg.effect_bar(0.0, 0.0))  # zero delta + zero scale
         self._well_formed(svg.hbar(12, 40))
         self._well_formed(svg.hbar(0, 0))  # empty
+        self._well_formed(svg.hbar(0.07, 0.2, show_label=False))  # magnitude bar, no label
+
+    def test_hbar_label_toggle(self):
+        # count bars print the integer value; magnitude bars omit it so a
+        # fractional gap doesn't render as a meaningless int() '0'
+        self.assertIn("<text", svg.hbar(12, 40))
+        self.assertNotIn("<text", svg.hbar(0.07, 0.2, show_label=False))
 
     def test_effect_bar_sign_color(self):
         self.assertIn(svg.POS, svg.effect_bar(0.05, 0.1))