Compare distribution bars: Max/Min range rows + non-overlapping labels (#86)

* Distribution bars: split the in-bar range into Max/Min rows

The min–max range inside each distribution bar packed onto one line
(e.g. -20–-16°), where the range dash collides with the minus signs and
becomes unreadable for negative temperatures. Split it into two labelled
rows — Max on top, Min below — so each value stands alone. The per-tier
average above each bar is unchanged.

Shared by the Compare distribution and the Calendar totals strip. Bump
the bar-height floor 26→30px so the two-line label never clips.

* Compare: nudge overlapping distribution-bar labels apart on desktop

The desktop key positioned each bucket label at its segment's midpoint, so
two small adjacent buckets (e.g. Warm 1% next to Too hot 2%) rendered their
labels on top of each other. Add a post-layout pass that measures each label
and sweeps the row — push right to clear the previous label, clamp the tail
to the bar's right edge, then pull left — so no two overlap while each stays
as close to its segment as the space allows. Re-runs on resize; mobile keeps
its plain wrapping row.

static/compare.js

@@ -520,6 +520,44 @@ function renderResults() {
 
   results.innerHTML = scored.map((x, i) => rankCard(x.loc, x.s, i + 1)).join("") +
     (loading ? Array.from({ length: loading }, skeletonRow).join("") : "");
+  spreadKeys();
+}
+
+// The desktop key positions each label at its segment's midpoint, so two small
+// adjacent buckets (e.g. Warm 1% right next to Too hot 2%) render their labels on
+// top of each other. After layout, measure each label and sweep the row so no two
+// overlap: push right to clear the previous label, clamp the tail to the right edge,
+// then pull left — keeping every label as close to its segment as the space allows.
+// Mobile uses a plain wrapping row, so there we just clear any positions we applied.
+function spreadKeys() {
+  const desktop = window.matchMedia("(min-width: 641px)").matches;
+  results.querySelectorAll(".cmp-key").forEach((keyEl) => {
+    const items = [...keyEl.children];
+    if (!desktop) {
+      items.forEach((el) => { el.style.left = el.style.right = el.style.transform = ""; });
+      return;
+    }
+    if (items.length < 2) return;
+    const W = keyEl.clientWidth, gap = 10;
+    // Ideal centre (px) for each label, honouring the end anchors (first pinned to
+    // the left edge, last to the right); middles sit at their inline midpoint %.
+    const m = items.map((el, i) => {
+      const hw = el.offsetWidth / 2;
+      const c = i === 0 ? hw
+        : i === items.length - 1 ? W - hw
+        : (parseFloat(el.style.left) / 100) * W;
+      return { el, hw, c };
+    });
+    for (let i = 1; i < m.length; i++)                       // forward: clear the previous label
+      m[i].c = Math.max(m[i].c, m[i - 1].c + m[i - 1].hw + gap + m[i].hw);
+    m[m.length - 1].c = Math.min(m[m.length - 1].c, W - m[m.length - 1].hw);
+    for (let i = m.length - 2; i >= 0; i--)                  // backward: pull back within the edge
+      m[i].c = Math.min(m[i].c, m[i + 1].c - m[i + 1].hw - gap - m[i].hw);
+    m[0].c = Math.max(m[0].c, m[0].hw);                      // keep the first inside the left edge
+    m.forEach(({ el, c }) => {
+      el.style.left = `${c}px`; el.style.right = "auto"; el.style.transform = "translateX(-50%)";
+    });
+  });
 }
 
 // ---- distribution (independent of the comfort filter) ----
@@ -605,6 +643,14 @@ thiInput.addEventListener("input", () => { thi = Math.max(+thiInput.value, hi);
 // (its per-category averages + ranges are in the active unit).
 onUnitChange(() => { syncSlicer(); renderResults(); renderDist(); });
 
+// Label widths (and the desktop/mobile threshold) move with the viewport, so
+// re-spread the rank-card keys after the layout settles.
+let spreadRaf = 0;
+window.addEventListener("resize", () => {
+  cancelAnimationFrame(spreadRaf);
+  spreadRaf = requestAnimationFrame(spreadKeys);
+});
+
 // Distribution metric: an inline selector (by the chart) plus a synced copy in the
 // filter sheet. Either one drives the shared distMetric; both reflect the active state.
 const syncDistButtons = () =>