fix: enhance accessibility for Select component with ARIA attributes

services/frontend/src/app/(dashboard)/dashboard/view.tsx

@@ -58,7 +58,7 @@ export function DashboardView({
     error,
     mutate: mutateStats,
   } = useStats(initialStats);
-  const { data: activity } = useActivity(14, initialActivity as never);
+  const { data: activity } = useActivity(14, initialActivity);
   const { data: reactions } = useTopReactions();
   const ambient = useAmbient();
 

services/frontend/src/components/ambient/ambient-canvas.tsx

@@ -35,15 +35,18 @@ export function AmbientCanvas({
     let raf = 0;
     let last = performance.now();
 
-    // Lerp state
+    // Lerp state (start values match the inline style defaults on the element).
     let r = 45,
       g = 212,
       b = 191;
-    let targetR = 45,
-      targetG = 212,
-      targetB = 191;
     let intensity = 0.35;
-    let targetIntensity = 0.35;
+    // Last values actually written to the DOM — lets us skip `setProperty`
+    // entirely once a channel settles, so the continuous loop stops invalidating
+    // style/layout every frame when the ambient is static.
+    let lastR = -1,
+      lastG = -1,
+      lastB = -1,
+      lastAlpha = "-1";
 
     const lerp = (a: number, b: number, t: number) => a + (b - a) * t;
 
@@ -53,21 +56,34 @@ export function AmbientCanvas({
 
       const tgt = targetRef.current;
       const [tr, tg, tb] = TONE_css[tgt.tone].split(",").map(Number);
-      targetR = tr;
-      targetG = tg;
-      targetB = tb;
-      targetIntensity = 0.15 + tgt.intensity * 0.85;
+      const targetIntensity = 0.15 + tgt.intensity * 0.85;
 
-      r = lerp(r, targetR, 0.03);
-      g = lerp(g, targetG, 0.03);
-      b = lerp(b, targetB, 0.03);
+      r = lerp(r, tr, 0.03);
+      g = lerp(g, tg, 0.03);
+      b = lerp(b, tb, 0.03);
       intensity = lerp(intensity, targetIntensity, 0.03);
 
       const root = mount;
-      root.style.setProperty("--ab-r", String(Math.round(r)));
-      root.style.setProperty("--ab-g", String(Math.round(g)));
-      root.style.setProperty("--ab-b", String(Math.round(b)));
-      root.style.setProperty("--ab-alpha", intensity.toFixed(3));
+      const R = Math.round(r);
+      const G = Math.round(g);
+      const B = Math.round(b);
+      const A = intensity.toFixed(3);
+      if (R !== lastR) {
+        root.style.setProperty("--ab-r", String(R));
+        lastR = R;
+      }
+      if (G !== lastG) {
+        root.style.setProperty("--ab-g", String(G));
+        lastG = G;
+      }
+      if (B !== lastB) {
+        root.style.setProperty("--ab-b", String(B));
+        lastB = B;
+      }
+      if (A !== lastAlpha) {
+        root.style.setProperty("--ab-alpha", A);
+        lastAlpha = A;
+      }
 
       raf = requestAnimationFrame(frame);
     };

services/frontend/src/components/primitives/select.tsx

@@ -101,6 +101,9 @@ export function Select({
           ref={triggerRef}
           type="button"
           onClick={() => setOpen((o) => !o)}
+          aria-haspopup="listbox"
+          aria-expanded={open}
+          aria-label={selected?.label ?? placeholder}
           className={cn(
             "flex w-full items-center justify-between gap-2 rounded-[8px] border border-hairline bg-surface-2 text-left text-ink transition-colors hover:border-signal/40",
             "focus:outline-none focus:border-signal/60",
@@ -123,6 +126,7 @@ export function Select({
         createPortal(
           <div
             ref={dropdownRef}
+            role="listbox"
             className="glass fixed z-[9999] max-h-72 overflow-auto p-1.5"
             style={{
               top: pos.top,
@@ -138,6 +142,8 @@ export function Select({
               <button
                 key={o.value}
                 type="button"
+                role="option"
+                aria-selected={o.value === value}
                 onClick={() => {
                   onChange(o.value);
                   setOpen(false);

services/frontend/src/components/shell/nav-rail.tsx

@@ -1,7 +1,8 @@
 "use client";
 
 import { usePathname } from "next/navigation";
-import { useEffect, useRef } from "react";
+import { useEffect, useRef, useState } from "react";
+import { createPortal } from "react-dom";
 import { isActivePath, navItems } from "@/lib/navigation";
 import { cn } from "@/lib/utils";
 
@@ -16,11 +17,35 @@ function NavItem({
   active: boolean;
   Icon: React.ComponentType<React.SVGProps<SVGSVGElement>>;
 }) {
+  const itemRef = useRef<HTMLAnchorElement>(null);
+  const [tipPos, setTipPos] = useState<{ top: number; left: number } | null>(null);
+  const [hovering, setHovering] = useState(false);
+
+  // Measure the item and position the tooltip via a Portal on document.body
+  // so it always paints above the main content (which has its own stacking
+  // contexts from backdrop-blur panels).
+  const showTooltip = () => {
+    const el = itemRef.current;
+    if (!el) return;
+    const rect = el.getBoundingClientRect();
+    setTipPos({ top: rect.top + rect.height / 2, left: rect.right + 10 });
+    setHovering(true);
+  };
+  const hideTooltip = () => {
+    setHovering(false);
+    setTipPos(null);
+  };
+
   return (
     <a
+      ref={itemRef}
       href={href}
       aria-label={label}
       aria-current={active ? "page" : undefined}
+      onMouseEnter={showTooltip}
+      onMouseLeave={hideTooltip}
+      onFocus={showTooltip}
+      onBlur={hideTooltip}
       className={cn(
         "nav-dock-item group relative flex size-9 items-center justify-center rounded-[8px] transition-all duration-150",
         active
@@ -32,9 +57,25 @@ function NavItem({
       {active && (
         <span className="absolute -left-[5px] h-3.5 w-[2px] rounded-full bg-signal shadow-[0_0_8px_var(--color-signal-glow)]" />
       )}
-      <span className="pointer-events-none absolute left-full z-50 ml-2.5 hidden whitespace-nowrap rounded-md border border-hairline bg-surface px-2 py-0.5 font-sans text-[11px] font-medium tracking-tight text-ink opacity-0 shadow-lg backdrop-blur-md transition-all group-hover:translate-x-0.5 group-hover:opacity-100 md:block">
-        {label}
-      </span>
+
+      {/* Tooltip — portalled to body so it never hides behind content */}
+      {hovering &&
+        tipPos &&
+        typeof document !== "undefined" &&
+        createPortal(
+          <span
+            role="tooltip"
+            className="pointer-events-none fixed z-[9999] translate-y-[-50%] whitespace-nowrap rounded-md border border-hairline bg-surface px-2.5 py-1 font-sans text-[11px] font-medium tracking-tight text-ink shadow-xl backdrop-blur-md"
+            style={{
+              top: tipPos.top,
+              left: tipPos.left,
+              animation: "fade-up 0.12s ease",
+            }}
+          >
+            {label}
+          </span>,
+          document.body,
+        )}
     </a>
   );
 }