Chart builder: intent front door, Heatmap mark, role-aware guidance

src/app/components/ChartBuilderModal.module.css

@@ -58,6 +58,79 @@
   gap: var(--space-3);
 }
 
+/* ── Intent front door (spec §06 → Intent) ───────────────────────────────
+   A persistent "what do you want to show?" strip under the dataset picker. A
+   quiet accent-soft wash marks it as the guided on-ramp without competing with
+   the primary Create action (--accent stays reserved for primary actions). */
+.intentStrip {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-2);
+  padding: var(--space-4);
+  border: var(--border-width) solid var(--border);
+  background: var(--accent-soft);
+}
+
+.intentQ {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--text);
+}
+
+.intentSub {
+  margin: 0;
+  font-size: 12px;
+  line-height: 1.45;
+  color: var(--text-secondary);
+}
+
+.intentChips {
+  display: flex;
+  flex-wrap: wrap;
+  gap: var(--space-2);
+  margin-top: var(--space-1);
+}
+
+.intentChip {
+  appearance: none;
+  height: var(--control-height);
+  border: var(--border-width) solid var(--border-strong);
+  background: var(--bg);
+  color: var(--text);
+  font: inherit;
+  font-size: 12px;
+  padding: 0 var(--space-3);
+  cursor: pointer;
+  transition:
+    background var(--dur-fast) var(--ease),
+    box-shadow var(--dur-fast) var(--ease);
+}
+
+.intentChip:hover {
+  background: var(--field);
+}
+
+/* The chip whose layout the live chart matches (council-reserved: selection uses an
+   accent ring, never an accent fill — fill stays the primary-action signal). */
+.intentChip[aria-pressed='true'] {
+  border-color: var(--accent);
+  box-shadow: inset 0 0 0 1px var(--accent);
+}
+
+/* Disabled = the dataset can't satisfy this intent: perceivable but inert (the chip's
+   accessible name carries the reason). */
+.intentChip[aria-disabled='true'] {
+  color: var(--text-placeholder);
+  border-color: var(--border);
+  background: var(--bg);
+  cursor: not-allowed;
+}
+
+.intentChip:focus-visible {
+  outline: 2px solid var(--focus);
+  outline-offset: 1px;
+}
+
 /* ── Data section: filters, calculated fields, row preview (spec §06 → Data) ──── */
 
 .dataSection {
@@ -346,6 +419,18 @@
   gap: var(--space-2);
 }
 
+/* The mark picker carries six segments — too many for one 320–360px row. Override the
+   SegmentedControl's fixed single-row height so it wraps; each option keeps the control
+   height so the two rows read as even segments inside the shared border. */
+.markPicker {
+  flex-wrap: wrap;
+  height: auto;
+}
+
+.markPickerOption {
+  min-height: var(--control-height);
+}
+
 .fieldLabel {
   font-size: 12px;
   font-weight: 500;