polish(mobile-sticky-bar): tighten labels, 24px icons, 64px tap targets

- Rename WhatsApp label from "WhatsApp" (8 chars) to "Chat" (4) so every
  visible label fits the ≤7-char action-verb policy and never triggers
  the new text-overflow:ellipsis safety net even at 320px (iPhone SE).
- Bump inline SVG icons to 24×24 (was 22), set min-height 64px and
  min-width 44px per Apple HIG / WCAG 2.5.5 tap-target requirements.
- Add white-space:nowrap + text-overflow:ellipsis as defensive safety
  net, plus a 320-359px breakpoint that nudges label to 11px / padding
  to 4px-horizontal so glyph-width drift can't cause overflow.
- Rewrite aria-labels to be action-led + descriptive even when visible
  text is terse: "Call us", "Chat with us on WhatsApp", "Get a free
  quote" (WCAG 2.5.3 name-in-name).
- Bump BaseLayout bottom-spacer from 64px → 72px so the new
  PricingTimelineBand and GuaranteeBand always have an 8px visual
  buffer above the fixed sticky bar (no overlap).

Verified: build green, all 6 tests in tests/sticky-cta.spec.ts pass
against the restarted frontend service. Probed live at 320 / 375 /
414 px — every button is 64px tall, ≥103px wide, icons 24×24, labels
never truncate. Footer fully clears the bar at scroll-bottom.

src/components/MobileStickyCtaBar.astro

@@ -1,11 +1,19 @@
 ---
 // MobileStickyCtaBar — Sticky bottom action bar for mobile/tablet (<768px)
-// 3 equal columns: Call, WhatsApp, Quote
+// 3 equal columns: Call, Chat (WhatsApp), Quote
 // - Fixed to bottom of viewport
 // - Respects safe-area-inset-bottom on iOS
 // - Hidden at md+ breakpoints (>=768px)
 // - Hidden on print
 // - Light + dark theme aware
+//
+// Label policy (post-polish):
+// - Short, action-led verbs (max ~7 chars) so they never truncate even at 320px.
+// - Visible text intentionally terse; aria-label carries the full descriptive
+//   phrasing for screen readers (Apple HIG / WCAG SC 2.5.3 name-in-name).
+// - 24px inline SVG icons sit above each label. Tap target is ~64px tall
+//   and >=44px wide per column at 320px (320 / 3 ≈ 106px), satisfying
+//   Apple HIG (44x44) and WCAG 2.5.5 (Target Size).
 ---
 
 <nav
@@ -15,13 +23,15 @@
 >
   <a
     href="tel:+919561417403"
-    aria-label="Call WorkRoot"
+    aria-label="Call us"
     data-testid="mobile-cta-call"
     class="mobile-sticky-cta__btn"
   >
     <svg
       class="mobile-sticky-cta__icon"
       xmlns="http://www.w3.org/2000/svg"
+      width="24"
+      height="24"
       viewBox="0 0 24 24"
       fill="none"
       stroke="currentColor"
@@ -40,13 +50,15 @@
     href="https://wa.me/919561417403?text=Hi%20WorkRoot%2C%20I%27d%20like%20to%20discuss%20a%20project."
     target="_blank"
     rel="noopener"
-    aria-label="Chat on WhatsApp"
+    aria-label="Chat with us on WhatsApp"
     data-testid="mobile-cta-whatsapp"
     class="mobile-sticky-cta__btn mobile-sticky-cta__btn--whatsapp"
   >
     <svg
       class="mobile-sticky-cta__icon"
       xmlns="http://www.w3.org/2000/svg"
+      width="24"
+      height="24"
       viewBox="0 0 24 24"
       fill="currentColor"
       aria-hidden="true"
@@ -54,18 +66,20 @@
     >
       <path d="M17.472 14.382c-.297-.149-1.758-.867-2.03-.967-.273-.099-.471-.148-.67.15-.197.297-.767.966-.94 1.164-.173.199-.347.223-.644.075-.297-.15-1.255-.463-2.39-1.475-.883-.788-1.48-1.761-1.653-2.059-.173-.297-.018-.458.13-.606.134-.133.298-.347.446-.52.149-.174.198-.298.298-.497.099-.198.05-.371-.025-.52-.075-.149-.669-1.612-.916-2.207-.242-.579-.487-.5-.669-.51-.173-.008-.371-.01-.57-.01-.198 0-.52.074-.792.372-.272.297-1.04 1.016-1.04 2.479 0 1.462 1.065 2.875 1.213 3.074.149.198 2.096 3.2 5.077 4.487.709.306 1.262.489 1.694.625.712.227 1.36.195 1.871.118.571-.085 1.758-.719 2.006-1.413.248-.694.248-1.289.173-1.413-.074-.124-.272-.198-.57-.347m-5.421 7.403h-.004a9.87 9.87 0 01-5.031-1.378l-.361-.214-3.741.982.998-3.648-.235-.374a9.86 9.86 0 01-1.51-5.26c.001-5.45 4.436-9.884 9.888-9.884 2.64 0 5.122 1.03 6.988 2.898a9.825 9.825 0 012.893 6.994c-.003 5.45-4.437 9.884-9.885 9.884m8.413-18.297A11.815 11.815 0 0012.05 0C5.495 0 .16 5.335.157 11.892c0 2.096.547 4.142 1.588 5.945L.057 24l6.305-1.654a11.882 11.882 0 005.683 1.448h.005c6.554 0 11.89-5.335 11.893-11.893A11.821 11.821 0 0020.464 3.488"/>
     </svg>
-    <span class="mobile-sticky-cta__label">WhatsApp</span>
+    <span class="mobile-sticky-cta__label">Chat</span>
   </a>
 
   <a
     href="/contact"
-    aria-label="Request a quote"
+    aria-label="Get a free quote"
     data-testid="mobile-cta-quote"
     class="mobile-sticky-cta__btn mobile-sticky-cta__btn--accent"
   >
     <svg
       class="mobile-sticky-cta__icon"
       xmlns="http://www.w3.org/2000/svg"
+      width="24"
+      height="24"
       viewBox="0 0 24 24"
       fill="none"
       stroke="currentColor"
@@ -96,7 +110,7 @@
     border-top: 1px solid rgba(15, 23, 42, 0.08);
     box-shadow: 0 -8px 20px -8px rgba(15, 23, 42, 0.18);
     padding-bottom: env(safe-area-inset-bottom, 0px);
-    /* Ensure no horizontal overflow on very narrow viewports */
+    /* Ensure no horizontal overflow on very narrow viewports (down to 320px) */
     max-width: 100vw;
     overflow: hidden;
   }
@@ -112,8 +126,12 @@
     flex-direction: column;
     align-items: center;
     justify-content: center;
-    gap: 2px;
+    gap: 4px;
-    min-height: 56px;
+    /* 44x44 minimum tap target per Apple HIG / WCAG 2.5.5.
+       64px gives comfortable thumb-zone clearance for the 24px icon
+       + 12px label without ever clipping. */
+    min-height: 64px;
+    min-width: 44px;
     padding: 8px 6px;
     text-decoration: none;
     color: #0f172a;
@@ -157,15 +175,35 @@
   }
 
   .mobile-sticky-cta__icon {
-    width: 22px;
+    width: 24px;
-    height: 22px;
+    height: 24px;
     flex-shrink: 0;
   }
 
   .mobile-sticky-cta__label {
     display: block;
-    font-size: 11px;
+    /* Font tuned so labels (Call/Chat/Quote, ≤5 chars) never overflow
+       even at 320px (column ≈ 106px – 12px padding = 94px usable).
+       The nowrap + ellipsis pair below is a defensive safety net only —
+       at the tuned sizes it should never visibly trigger. */
+    font-size: 12px;
     letter-spacing: 0.01em;
+    max-width: 100%;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+
+  /* Drop label font a hair on the smallest phones (iPhone SE: 320px).
+     This keeps the ellipsis safety net from ever triggering even if the
+     system font swaps in slightly wider glyphs. */
+  @media (max-width: 359px) {
+    .mobile-sticky-cta__label {
+      font-size: 11px;
+    }
+    .mobile-sticky-cta__btn {
+      padding: 8px 4px;
+    }
   }
 
   /* Hide on tablets/desktops (>=768px = Tailwind md breakpoint).

src/layouts/BaseLayout.astro

@@ -292,8 +292,12 @@ const fullTitle = title === 'Home' ? siteName : `${title} | ${siteName}`;
     <!-- Footer -->
     <Footer />
 
-    <!-- Spacer to ensure footer/content clears the mobile sticky CTA bar (<md only) -->
+    <!-- Spacer to ensure footer/content (incl. PricingTimelineBand, GuaranteeBand,
-    <div aria-hidden="true" class="md:hidden h-[calc(64px+env(safe-area-inset-bottom,0px))] w-full"></div>
+         and any other bottom-of-page sections) clears the mobile sticky CTA bar.
+         Bar min-height is 64px; we use 72px here so there is always an 8px
+         visual breathing strip between the last band and the sticky bar.
+         <md only — bar is hidden at md+. -->
+    <div aria-hidden="true" class="md:hidden h-[calc(72px+env(safe-area-inset-bottom,0px))] w-full"></div>
 
     <!-- Mobile sticky bottom CTA bar (visible <md) -->
     <MobileStickyCtaBar />