feat: dashboard Second Brain, essai 7 jours et vérification e-mail

Rendre le dashboard actionnable (inbox, peek, carte mentale), aligner la facturation sur l’essai 7 jours, et bloquer le login e-mail tant que l’adresse n’est pas confirmée.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/components/interactive-demo/demo-scene-view.tsx

@@ -50,8 +50,10 @@ function elementOpacity(
   state: StepResolvedState,
   dim: number
 ): number {
+  // Overview = full scene at full brightness (matches edges behavior)
+  if (state.overview) return 1
   if (!(id in state.revealed)) return 0
-  if (state.overview || state.spotlight.length === 0) return 1
+  if (state.spotlight.length === 0) return 1
   return state.spotlight.includes(id) ? 1 : dim
 }
 
@@ -750,6 +752,11 @@ function HeatmapPanel({
   const dim = dimOpacity(dark)
   const fillIntent = spotlightColor(dark)
   const ghostStroke = dark ? 'rgba(255,255,255,0.2)' : 'rgba(0,0,0,0.16)'
+  // Intensity ∝ value — normalized so real-world scales (not just [0,1]) work
+  const maxAbsV = Math.max(
+    1e-9,
+    ...values.flat().map((v) => Math.abs(v))
+  )
 
   const cellRect = (r: number, c: number) => ({
     x: labelW + (c - 1) * cell,
@@ -778,8 +785,23 @@ function HeatmapPanel({
     return map
   }, [rows, cols, triangular])
 
+  const uid = useId().replace(/:/g, '')
+  const markerId = `demo-arrowhead-hm-${uid}`
+
   return (
     <svg viewBox={`0 0 ${w} ${h}`} className="w-full h-auto max-w-lg mx-auto">
+      <defs>
+        <marker
+          id={markerId}
+          markerWidth="9"
+          markerHeight="9"
+          refX="7"
+          refY="3.5"
+          orient="auto"
+        >
+          <path d="M0,0 L7,3.5 L0,7 Z" fill={fillIntent} />
+        </marker>
+      </defs>
       {colLabels?.map((lab, i) => (
         <text
           key={`c-${i}`}
@@ -839,9 +861,10 @@ function HeatmapPanel({
             )
           }
 
-          const fillOpacity = 0.14 + v * 0.78
+          const vNorm = Math.min(1, Math.abs(v) / maxAbsV)
+          const fillOpacity = 0.14 + vNorm * 0.78
           const textFill =
-            v > 0.45 ? (dark ? '#0a0a0a' : '#fff') : dark ? '#eee' : '#111'
+            vNorm > 0.45 ? (dark ? '#0a0a0a' : '#fff') : dark ? '#eee' : '#111'
 
           return (
             <g key={id} opacity={op} style={{ transition }}>
@@ -874,7 +897,7 @@ function HeatmapPanel({
       <AnnotationsOverlay
         annotations={state.annotations}
         dark={dark}
-        markerId="demo-arrowhead-hm"
+        markerId={markerId}
         getAnchor={(id, kind) => {
           const p = positions.get(id)
           if (!p) return null