Fix/ Step Comparing Step Restriction (#5)

* feat: add learning website with Next.js

Add interactive web interface for the Build Your Own OpenClaw tutorial:
- Next.js app with TypeScript and Tailwind CSS
- Theme provider with dark/light mode toggle
- Step card components with diff visualization
- Utilities for loading step metadata and file diffs

* chore: ignore worktrees directory

* feat(web): implement learning website with step navigation and diff viewer

- Landing page with hero section and steps overview grouped by phase
- Step detail pages with README rendering and syntax highlighting (Shiki)
- Diff comparison pages with side-by-side GitHub-style viewer
- Custom 404 Not Found page
- Components: ReadmeRenderer, CodeBlock, DiffViewer, DiffSelector
- Generates 175 static pages (18 steps + 153 diff combinations)

* feat(web): enhance UI with zane-portfolio theme and improved UX

- Update color scheme to match zane-portfolio style (warm beige light, pure black dark)
- Add scrollbar styling for light/dark modes
- Fix card border visibility in dark mode
- Add GitHub CTA section with clone command and copy button
- Add star on GitHub call-to-action
- Use favicons from zane-portfolio
- Improve diff viewer with scroll sync and collapsible files
- Add sticky header with file navigation dropdown
- Rewrite README links to GitHub and internal step pages
- Remove default create-next-app template files

* ci: add GitHub Pages deployment workflow

- Add workflow to build and deploy Next.js static site
- Configure custom domain (build-your-own-openclaw.kiyo-n-zane.com)
- Trigger on push to main branch

* fix config

* fix config

* fix config

* fix web navigation bug

web/app/steps/[id]/diff/[to]/page.tsx

@@ -1,9 +1,10 @@
 import { notFound } from 'next/navigation'
 import Link from 'next/link'
 import { getStep, getSteps } from '@/lib/steps'
-import { getChangedFiles, getUnchangedFiles, type FileDiff } from '@/lib/files'
+import { getChangedFiles, getUnchangedFiles } from '@/lib/files'
 import { DiffViewer } from '@/components/diff-viewer'
 import { FileNavDropdown } from '@/components/file-nav-dropdown'
+import { DiffPageSelector } from '@/components/diff-page-selector'
 import {
   Breadcrumb,
   BreadcrumbList,
@@ -12,8 +13,6 @@ import {
   BreadcrumbPage,
   BreadcrumbSeparator,
 } from '@/components/ui/breadcrumb'
-import { H2, Muted } from '@/components/ui/typography'
-import { PlusIcon, MinusIcon } from 'lucide-react'
 
 interface DiffPageProps {
   params: Promise<{
@@ -29,10 +28,10 @@ export async function generateStaticParams() {
   // Generate all valid combinations where from < to
   for (let i = 0; i < steps.length - 1; i++) {
     for (let j = i + 1; j < steps.length; j++) {
-      params.push({
-        id: steps[i].id,
-        to: steps[j].id,
-      })
+        params.push({
+          id: steps[i].id,
+          to: steps[j].id,
+        })
     }
   }
 
@@ -53,21 +52,6 @@ export async function generateMetadata({ params }: DiffPageProps) {
   }
 }
 
-// Status type for changed files (excludes 'unchanged')
-type ChangedStatus = 'added' | 'removed' | 'modified'
-
-// Get status icon for file
-function getStatusIcon(status: ChangedStatus) {
-  switch (status) {
-    case 'added':
-      return <PlusIcon className="size-3 text-green-500" />
-    case 'removed':
-      return <MinusIcon className="size-3 text-red-500" />
-    case 'modified':
-      return null
-  }
-}
-
 export default async function DiffPage({ params }: DiffPageProps) {
   const { id, to } = await params
   const fromStep = getStep(id)
@@ -112,15 +96,13 @@ export default async function DiffPage({ params }: DiffPageProps) {
 
       {/* Sticky Page Header */}
       <div className="sticky top-14 z-40 -mx-4 px-4 py-4 bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/60 border-b mb-8">
-        <div className="flex items-center justify-between">
-          <div>
-            <H2 className="mb-1">
-              Step {fromStep.id} to Step {toStep.id}
-            </H2>
-            <Muted>
-              Comparing &quot;{fromStep.title}&quot; with &quot;{toStep.title}&quot;
-            </Muted>
-          </div>
+        <div className="flex items-center justify-between gap-4">
+          <DiffPageSelector
+            fromStep={fromStep}
+            toStep={toStep}
+            fromSteps={getSteps().filter((s) => parseInt(s.id) < parseInt(toStep.id))}
+            toSteps={getSteps().filter((s) => parseInt(s.id) > parseInt(fromStep.id))}
+          />
           {changedFiles.length > 0 && (
             <FileNavDropdown
               files={changedFiles.map((file) => ({

web/app/steps/[id]/page.tsx

@@ -5,7 +5,7 @@ import { ChevronLeft, ChevronRight } from 'lucide-react'
 
 import { getStep, getSteps } from '@/lib/steps'
 import { ReadmeRenderer } from '@/components/readme-renderer'
-import { DiffSelector } from '@/components/diff-selector'
+import { StepDiffSelector } from '@/components/step-diff-selector'
 import {
   Breadcrumb,
   BreadcrumbItem,
@@ -60,7 +60,7 @@ export default async function StepPage({ params }: PageProps) {
   const nextStep = currentIndex < steps.length - 1 ? steps[currentIndex + 1] : null
 
   // Steps available for diff comparison (excluding current step)
-  const diffTargets = steps.filter((s) => s.id !== step.id)
+  const diffTargets = steps.filter((s) => parseInt(s.id) > parseInt(step.id))
 
   return (
     <div className="container py-8">
@@ -94,7 +94,7 @@ export default async function StepPage({ params }: PageProps) {
         </H1>
 
         {/* Diff action dropdown */}
-        <DiffSelector currentStepId={step.id} steps={diffTargets} />
+        <StepDiffSelector currentStepId={step.id} steps={diffTargets} />
       </div>
 
       {/* README Content */}

web/components/diff-page-selector.tsx

@@ -0,0 +1,39 @@
+'use client'
+
+import { useRouter } from 'next/navigation'
+import { DiffSelector } from '@/components/diff-selector'
+import type { Step } from '@/lib/steps'
+
+interface DiffPageSelectorProps {
+  fromStep: Step
+  toStep: Step
+  fromSteps: Step[]
+  toSteps: Step[]
+}
+
+export function DiffPageSelector({
+  fromStep,
+  toStep,
+  fromSteps,
+  toSteps,
+}: DiffPageSelectorProps) {
+  const router = useRouter()
+
+  return (
+    <div className="flex items-center gap-2">
+      <DiffSelector
+        steps={fromSteps}
+        value={fromStep.id}
+        placeholder="From step..."
+        onSelect={(newFromId) => router.push(`/steps/${newFromId}/diff/${toStep.id}`)}
+      />
+      <span className="text-muted-foreground">→</span>
+      <DiffSelector
+        steps={toSteps}
+        value={toStep.id}
+        placeholder="To step..."
+        onSelect={(newToId) => router.push(`/steps/${fromStep.id}/diff/${newToId}`)}
+      />
+    </div>
+  )
+}

web/components/diff-selector.tsx

@@ -1,6 +1,5 @@
 'use client'
 
-import { useRouter } from 'next/navigation'
 import {
   Select,
   SelectContent,
@@ -11,28 +10,43 @@ import {
 import type { Step } from '@/lib/steps'
 
 interface DiffSelectorProps {
-  currentStepId: string
   steps: Step[]
+  value?: string
+  placeholder?: string
+  onSelect: (stepId: string) => void
 }
 
-export function DiffSelector({ currentStepId, steps }: DiffSelectorProps) {
-  const router = useRouter()
-
-  const handleValueChange = (value: string | null) => {
-    if (value) {
-      router.push(`/steps/${currentStepId}/diff/${value}`)
+export function DiffSelector({
+  steps,
+  value,
+  placeholder = 'Compare with...',
+  onSelect,
+}: DiffSelectorProps) {
+  const handleValueChange = (newValue: string | null) => {
+    if (newValue) {
+      onSelect(newValue)
     }
   }
 
+  const selectedStep = steps.find((s) => s.id === value)
+
   return (
-    <Select onValueChange={handleValueChange}>
-      <SelectTrigger className="min-w-64">
-        <SelectValue placeholder="Compare with..." />
+    <Select value={value} onValueChange={handleValueChange}>
+      <SelectTrigger className="min-w-48">
+        <SelectValue placeholder={placeholder}>
+          {selectedStep && (
+            <>
+              <span className="font-mono text-xs">{selectedStep.id}:</span>{' '}
+              <span className="text-xs">{selectedStep.title}</span>
+            </>
+          )}
+        </SelectValue>
       </SelectTrigger>
       <SelectContent>
-        {steps.map((target) => (
-          <SelectItem key={target.id} value={target.id}>
-            Step {target.id}: {target.title}
+        {steps.map((step) => (
+          <SelectItem key={step.id} value={step.id}>
+            <span className="font-mono text-xs">{step.id}:</span>{' '}
+            <span className="text-xs">{step.title}</span>
           </SelectItem>
         ))}
       </SelectContent>

web/components/step-diff-selector.tsx

@@ -0,0 +1,21 @@
+'use client'
+
+import { useRouter } from 'next/navigation'
+import { DiffSelector } from '@/components/diff-selector'
+import type { Step } from '@/lib/steps'
+
+interface StepDiffSelectorProps {
+  currentStepId: string
+  steps: Step[]
+}
+
+export function StepDiffSelector({ currentStepId, steps }: StepDiffSelectorProps) {
+  const router = useRouter()
+
+  return (
+    <DiffSelector
+      steps={steps}
+      onSelect={(targetId) => router.push(`/steps/${currentStepId}/diff/${targetId}`)}
+    />
+  )
+}