refactor(home): unify section headings, differentiate capabilities and process

Reduce the "interchangeable cards" monotony flagged in Phase 0 and apply the
warm-premium type scale.

- SectionHeading: use the type scale (eyebrow via .eyebrow with brand tint,
  text-h2 title, body-lg description). Propagates to every home section.
- CapabilitiesSection: cleaner cards with a brand-tinted icon tile, type-scale
  title/body, soft elevation (drops the AppCard wrapper).
- ProcessSection: reworked into an editorial numbered timeline (large
  translucent brand numerals, top rule, no boxes) so it no longer looks
  identical to Capabilities.

Verified: eslint clean, no new type errors, tailwind generates the utilities.

components/home/capabilities-section.tsx

@@ -1,6 +1,5 @@
 import { Bot, Database, Globe, ServerCog } from "lucide-react";
 
-import { AppCard } from "@/components/ui/app-card";
 import { SectionHeading } from "./section-heading";
 import type { CapabilitiesSectionCopy } from "./types";
 
@@ -19,29 +18,25 @@ export function CapabilitiesSection({ copy }: CapabilitiesSectionProps) {
         description={copy.description}
       />
 
-      <div className="grid grid-cols-1 gap-4 md:grid-cols-2 xl:grid-cols-4 xl:gap-6">
+      <div className="grid grid-cols-1 gap-5 md:grid-cols-2 xl:grid-cols-4">
         {copy.items.map((item, index) => {
           const Icon = capabilityIcons[index] ?? Globe;
 
           return (
-            <AppCard
+            <div
               key={item.title}
-              layer="single"
-              interactive
-              className="group border-border/80 bg-surface-2 transition-all duration-300 hover:-translate-y-1 hover:border-border-strong hover:shadow-panel"
+              className="group flex h-full flex-col gap-5 rounded-surface border border-border bg-surface-1 p-6 shadow-card transition duration-300 ease-out hover:-translate-y-1 hover:shadow-panel"
             >
-              <div className="flex h-full flex-col gap-5 p-6">
-                <div className="flex h-11 w-11 items-center justify-center rounded-nested border border-border/70 bg-background text-foreground transition-transform duration-300 group-hover:-translate-y-0.5">
+              <div className="flex h-12 w-12 items-center justify-center rounded-nested bg-brand-primary/10 text-brand-primary transition-transform duration-300 group-hover:-translate-y-0.5">
                 <Icon className="h-5 w-5" />
               </div>
-                <div className="space-y-3">
-                  <h3 className="text-xl font-semibold tracking-[-0.04em] text-foreground">
+              <div className="space-y-2">
+                <h3 className="text-title font-semibold text-foreground">
                   {item.title}
                 </h3>
-                  <p className="text-sm leading-7 text-muted-foreground">{item.description}</p>
+                <p className="text-small leading-relaxed text-muted-foreground">{item.description}</p>
               </div>
             </div>
-            </AppCard>
           );
         })}
       </div>

components/home/process-section.tsx

@@ -1,4 +1,3 @@
-import { AppCard } from "@/components/ui/app-card";
 import { SectionHeading } from "./section-heading";
 import type { ProcessSectionCopy } from "./types";
 
@@ -8,35 +7,28 @@ type ProcessSectionProps = {
 
 export function ProcessSection({ copy }: ProcessSectionProps) {
   return (
-    <section className="space-y-8">
+    <section className="space-y-10">
       <SectionHeading
         eyebrow={copy.eyebrow}
         title={copy.title}
         description={copy.description}
       />
 
-      <div className="grid grid-cols-1 gap-4 md:grid-cols-2 xl:grid-cols-4 xl:gap-6">
+      <ol className="grid grid-cols-1 gap-x-8 gap-y-10 sm:grid-cols-2 lg:grid-cols-4">
         {copy.steps.map((step, index) => (
-          <AppCard
-            key={step.title}
-            layer="single"
-            interactive
-            className="group border-border/80 bg-surface-2 transition-all duration-300 hover:-translate-y-1 hover:border-border-strong hover:shadow-panel"
-          >
-            <div className="flex h-full flex-col gap-5 p-6">
-              <p className="text-sm font-semibold tracking-[0.18em] text-muted-foreground">
+          <li key={step.title} className="border-t border-border pt-5">
+            <span className="block text-[2.75rem] font-semibold leading-none tracking-tight text-brand-primary/25">
               {String(index + 1).padStart(2, "0")}
-              </p>
-              <div className="space-y-3">
-                <h3 className="text-2xl font-semibold tracking-[-0.05em] text-foreground">
+            </span>
+            <h3 className="mt-5 text-title font-semibold text-foreground">
               {step.title}
             </h3>
-                <p className="text-sm leading-7 text-muted-foreground">{step.description}</p>
-              </div>
-            </div>
-          </AppCard>
+            <p className="mt-2 text-small leading-relaxed text-muted-foreground">
+              {step.description}
+            </p>
+          </li>
         ))}
-      </div>
+      </ol>
     </section>
   );
 }

components/home/section-heading.tsx

@@ -23,13 +23,13 @@ export function SectionHeading({
         className,
       )}
     >
-      <p className="text-xs font-semibold uppercase tracking-[0.16em] text-muted-foreground">
+      <p className="eyebrow text-caption font-medium text-brand-primary">
         {eyebrow}
       </p>
-      <h2 className="max-w-4xl text-balance text-3xl font-semibold tracking-[-0.05em] text-foreground sm:text-4xl lg:text-5xl">
+      <h2 className="max-w-4xl text-balance text-h2 text-foreground">
         {title}
       </h2>
-      <p className="max-w-3xl text-sm leading-7 text-muted-foreground sm:text-[1.02rem]">
+      <p className={cn("text-body-lg text-muted-foreground", align === "center" ? "mx-auto" : "max-w-2xl")}>
         {description}
       </p>
     </div>