feat: add Week 4 documentation (implementation guide, component examples, HANDOFF update)

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+# Form Component Guide
+
+Quick reference for all form components with usage examples.
+
+---
+
+## Table of Contents
+
+1. [Input Fields](#input-fields)
+2. [Textareas](#textareas)
+3. [Select Dropdowns](#select-dropdowns)
+4. [Checkboxes](#checkboxes)
+5. [Radio Buttons](#radio-buttons)
+6. [Form Groups](#form-groups)
+7. [Form Layouts](#form-layouts)
+8. [Modals](#modals)
+9. [Notifications](#notifications)
+10. [Tooltips](#tooltips)
+
+---
+
+## Input Fields
+
+### Basic Input
+
+```html
+<input type="text" class="form-input" placeholder="Enter text...">
+```
+
+### Email Input with Validation
+
+```html
+<div class="form-group">
+  <label for="email">Email</label>
+  <input type="email" id="email" class="form-input" placeholder="user@example.com">
+</div>
+```
+
+### Password Input
+
+```html
+<div class="form-group">
+  <label for="password">Password</label>
+  <input type="password" id="password" class="form-input" placeholder="••••••">
+  <div class="form-group-help">Must be at least 8 characters</div>
+</div>
+```
+
+### Number Input
+
+```html
+<div class="form-group">
+  <label for="quantity">Quantity</label>
+  <input type="number" id="quantity" class="form-input" value="1" min="1">
+</div>
+```
+
+### Disabled Input
+
+```html
+<input type="text" class="form-input" value="Cannot edit" disabled>
+```
+
+### Input with Error
+
+```html
+<div class="form-group error">
+  <label for="username">Username</label>
+  <input type="text" id="username" class="form-input error" value="invalid">
+  <div class="form-error">Username must be 3-20 characters</div>
+</div>
+```
+
+---
+
+## Textareas
+
+### Basic Textarea
+
+```html
+<textarea class="form-textarea" placeholder="Enter message..."></textarea>
+```
+
+### Textarea with Label and Help Text
+
+```html
+<div class="form-group">
+  <label for="bio">Bio</label>
+  <textarea id="bio" class="form-textarea" placeholder="Tell us about yourself..."></textarea>
+  <div class="form-group-help">Maximum 500 characters</div>
+</div>
+```
+
+### Auto-Expanding Textarea
+
+```html
+<div class="form-group">
+  <label for="auto-textarea">Auto-expanding Textarea</label>
+  <textarea 
+    id="auto-textarea" 
+    class="form-textarea auto-expand" 
+    placeholder="Grows as you type..."
+    @input="autoExpandTextarea($event)">
+  </textarea>
+</div>
+```
+
+---
+
+## Select Dropdowns
+
+### Basic Select
+
+```html
+<select class="form-select">
+  <option>Choose an option...</option>
+  <option>Option 1</option>
+  <option>Option 2</option>
+  <option>Option 3</option>
+</select>
+```
+
+### Select with Label
+
+```html
+<div class="form-group">
+  <label for="country">Country</label>
+  <select id="country" class="form-select">
+    <option>Select a country...</option>
+    <option value="us">United States</option>
+    <option value="uk">United Kingdom</option>
+    <option value="de">Germany</option>
+  </select>
+</div>
+```
+
+### Multi-Select
+
+```html
+<select class="form-select" multiple>
+  <option>Python</option>
+  <option>JavaScript</option>
+  <option>Go</option>
+  <option>Rust</option>
+</select>
+```
+
+---
+
+## Checkboxes
+
+### Single Checkbox
+
+```html
+<label class="flex items-center gap-3 cursor-pointer">
+  <input type="checkbox" class="form-checkbox">
+  <span>I agree to the terms and conditions</span>
+</label>
+```
+
+### Checkbox Group
+
+```html
+<fieldset>
+  <legend class="font-semibold">Select your interests</legend>
+  <div class="space-y-2 mt-3">
+    <label class="flex items-center gap-3 cursor-pointer">
+      <input type="checkbox" class="form-checkbox" name="interests" value="tech">
+      <span>Technology</span>
+    </label>
+    <label class="flex items-center gap-3 cursor-pointer">
+      <input type="checkbox" class="form-checkbox" name="interests" value="design">
+      <span>Design</span>
+    </label>
+    <label class="flex items-center gap-3 cursor-pointer">
+      <input type="checkbox" class="form-checkbox" name="interests" value="business">
+      <span>Business</span>
+    </label>
+  </div>
+</fieldset>
+```
+
+### Disabled Checkbox
+
+```html
+<label class="flex items-center gap-3 cursor-pointer opacity-50">
+  <input type="checkbox" class="form-checkbox" disabled>
+  <span>This option is not available</span>
+</label>
+```
+
+---
+
+## Radio Buttons
+
+### Radio Button Group
+
+```html
+<fieldset>
+  <legend class="font-semibold">Choose an option</legend>
+  <div class="space-y-2 mt-3">
+    <label class="flex items-center gap-3 cursor-pointer">
+      <input type="radio" name="option" class="form-radio" value="a">
+      <span>Option A</span>
+    </label>
+    <label class="flex items-center gap-3 cursor-pointer">
+      <input type="radio" name="option" class="form-radio" value="b">
+      <span>Option B</span>
+    </label>
+    <label class="flex items-center gap-3 cursor-pointer">
+      <input type="radio" name="option" class="form-radio" value="c">
+      <span>Option C</span>
+    </label>
+  </div>
+</fieldset>
+```
+
+### Inline Radio Buttons
+
+```html
+<div class="flex gap-6">
+  <label class="flex items-center gap-2 cursor-pointer">
+    <input type="radio" name="size" class="form-radio" value="sm">
+    <span>Small</span>
+  </label>
+  <label class="flex items-center gap-2 cursor-pointer">
+    <input type="radio" name="size" class="form-radio" value="md">
+    <span>Medium</span>
+  </label>
+  <label class="flex items-center gap-2 cursor-pointer">
+    <input type="radio" name="size" class="form-radio" value="lg">
+    <span>Large</span>
+  </label>
+</div>
+```
+
+---
+
+## Form Groups
+
+### Basic Form Group
+
+```html
+<div class="form-group">
+  <label for="name">Name</label>
+  <input type="text" id="name" class="form-input">
+</div>
+```
+
+### Required Form Group
+
+```html
+<div class="form-group required">
+  <label for="email">Email</label>
+  <input type="email" id="email" class="form-input" required>
+</div>
+```
+
+### Form Group with Help Text
+
+```html
+<div class="form-group">
+  <label for="username">Username</label>
+  <input type="text" id="username" class="form-input">
+  <div class="form-group-help">3-20 characters, alphanumeric only</div>
+</div>
+```
+
+### Form Group with Error
+
+```html
+<div class="form-group error">
+  <label for="password">Password</label>
+  <input type="password" id="password" class="form-input error">
+  <div class="form-error">Password must be at least 8 characters</div>
+</div>
+```
+
+---
+
+## Form Layouts
+
+### Single Column Form
+
+```html
+<form class="space-y-4">
+  <div class="form-group">
+    <label for="name">Name</label>
+    <input type="text" id="name" class="form-input">
+  </div>
+
+  <div class="form-group">
+    <label for="email">Email</label>
+    <input type="email" id="email" class="form-input">
+  </div>
+
+  <div class="form-group">
+    <label for="message">Message</label>
+    <textarea id="message" class="form-textarea"></textarea>
+  </div>
+
+  <button type="submit" class="btn btn-primary">Submit</button>
+</form>
+```
+
+### Two-Column Form (Responsive)
+
+```html
+<form class="space-y-4">
+  <div class="form-row">
+    <div class="form-group">
+      <label for="first">First Name</label>
+      <input type="text" id="first" class="form-input">
+    </div>
+    <div class="form-group">
+      <label for="last">Last Name</label>
+      <input type="text" id="last" class="form-input">
+    </div>
+  </div>
+
+  <div class="form-row">
+    <div class="form-group">
+      <label for="phone">Phone</label>
+      <input type="tel" id="phone" class="form-input">
+    </div>
+    <div class="form-group">
+      <label for="country">Country</label>
+      <select id="country" class="form-select">
+        <option>Select...</option>
+      </select>
+    </div>
+  </div>
+
+  <button type="submit" class="btn btn-primary">Submit</button>
+</form>
+```
+
+### Inline Form (Search)
+
+```html
+<div class="form-inline">
+  <div class="form-group">
+    <label for="search">Search</label>
+    <input type="search" id="search" class="form-input" placeholder="Type...">
+  </div>
+  <button class="btn btn-primary">Search</button>
+</div>
+```
+
+---
+
+## Modals
+
+### Alert Modal
+
+```html
+<div class="modal" :class="{ active: showAlert }" x-show="showAlert" x-data="{ showAlert: false }">
+  <div class="modal-backdrop" @click="showAlert = false"></div>
+  <div class="modal-content modal-sm">
+    <div class="modal-header">
+      <h3 class="modal-title">Alert</h3>
+      <div class="modal-close" @click="showAlert = false"></div>
+    </div>
+    <div class="modal-body">
+      <p>This is an important message.</p>
+    </div>
+    <div class="modal-footer">
+      <button class="btn btn-primary" @click="showAlert = false">OK</button>
+    </div>
+  </div>
+</div>
+
+<button @click="showAlert = true" class="btn btn-primary">Open Alert</button>
+```
+
+### Confirm Modal
+
+```html
+<div class="modal" :class="{ active: showConfirm }" x-show="showConfirm" x-data="{ showConfirm: false }">
+  <div class="modal-backdrop" @click="showConfirm = false"></div>
+  <div class="modal-content modal-sm">
+    <div class="modal-header">
+      <h3 class="modal-title">Confirm Action</h3>
+      <div class="modal-close" @click="showConfirm = false"></div>
+    </div>
+    <div class="modal-body">
+      <p>Are you sure you want to delete this item? This action cannot be undone.</p>
+    </div>
+    <div class="modal-footer">
+      <button class="btn btn-outline" @click="showConfirm = false">Cancel</button>
+      <button class="btn btn-primary" @click="handleDelete()">Delete</button>
+    </div>
+  </div>
+</div>
+```
+
+### Modal with Form
+
+```html
+<div class="modal" :class="{ active: showModal }" x-show="showModal" x-data="{ showModal: false, form: {} }">
+  <div class="modal-backdrop" @click="showModal = false"></div>
+  <div class="modal-content modal-md">
+    <div class="modal-header">
+      <h3 class="modal-title">Edit Profile</h3>
+      <div class="modal-close" @click="showModal = false"></div>
+    </div>
+    <form @submit.prevent="saveProfile()">
+      <div class="modal-body space-y-4">
+        <div class="form-group">
+          <label for="name">Name</label>
+          <input type="text" id="name" class="form-input" x-model="form.name">
+        </div>
+        <div class="form-group">
+          <label for="bio">Bio</label>
+          <textarea id="bio" class="form-textarea" x-model="form.bio"></textarea>
+        </div>
+      </div>
+      <div class="modal-footer">
+        <button type="button" class="btn btn-outline" @click="showModal = false">Cancel</button>
+        <button type="submit" class="btn btn-primary">Save</button>
+      </div>
+    </form>
+  </div>
+</div>
+```
+
+---
+
+## Notifications
+
+### Toast Notification
+
+```html
+<!-- Container in layout -->
+<div class="toast-container" x-data="formComponentsData()">
+  <template x-for="toast in toasts" :key="toast.id">
+    <div class="toast" :class="`toast-${toast.type}`">
+      <span x-text="toast.message"></span>
+      <div class="toast-close" @click="removeToast(toast.id)"></div>
+    </div>
+  </template>
+</div>
+
+<!-- Trigger toast -->
+<button @click="showToast('success', 'Item saved!')">Save</button>
+<button @click="showToast('error', 'Failed to delete.')">Delete</button>
+<button @click="showToast('info', 'Welcome back!')">Info</button>
+<button @click="showToast('warning', 'Unsaved changes.')">Warning</button>
+```
+
+### Toast Usage in Forms
+
+```html
+<form @submit.prevent="submitForm()">
+  <!-- Form fields -->
+  <button type="submit" class="btn btn-primary" :disabled="isSubmitting">
+    {{ isSubmitting ? 'Submitting...' : 'Submit' }}
+  </button>
+</form>
+
+<script>
+function formData() {
+  return {
+    isSubmitting: false,
+    async submitForm() {
+      this.isSubmitting = true;
+      try {
+        await fetch('/api/submit', { method: 'POST' });
+        this.showToast('success', 'Form submitted successfully!');
+      } catch (error) {
+        this.showToast('error', 'Failed to submit form.');
+      } finally {
+        this.isSubmitting = false;
+      }
+    }
+  };
+}
+</script>
+```
+
+---
+
+## Tooltips
+
+### Top Tooltip (Default)
+
+```html
+<div class="tooltip">
+  <span>Hover me</span>
+  <span class="tooltip-text">I'm a tooltip on top!</span>
+</div>
+```
+
+### Bottom Tooltip
+
+```html
+<div class="tooltip tooltip-bottom">
+  <span>Hover me</span>
+  <span class="tooltip-text">I'm below!</span>
+</div>
+```
+
+### Left Tooltip
+
+```html
+<div class="tooltip tooltip-left">
+  <span>Hover me</span>
+  <span class="tooltip-text">I'm on the left!</span>
+</div>
+```
+
+### Right Tooltip
+
+```html
+<div class="tooltip tooltip-right">
+  <span>Hover me</span>
+  <span class="tooltip-text">I'm on the right!</span>
+</div>
+```
+
+### Tooltip with Icon
+
+```html
+<div class="tooltip" title="Click to copy email">
+  <button class="btn btn-icon">
+    <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+      <path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z"></path>
+    </svg>
+  </button>
+  <span class="tooltip-text">Copy to clipboard</span>
+</div>
+```
+
+---
+
+## Loading States
+
+### Button with Spinner
+
+```html
+<button class="btn btn-primary" :disabled="isLoading">
+  <span x-show="isLoading" class="spinner mr-2"></span>
+  {{ isLoading ? 'Submitting...' : 'Submit' }}
+</button>
+```
+
+### Spinner Sizes
+
+```html
+<div class="spinner spinner-sm"></div>
+<div class="spinner"></div>
+<div class="spinner spinner-lg"></div>
+```
+
+---
+
+## Complete Contact Form Example
+
+```html
+<form x-data="formComponentsData()" @submit.prevent="submitForm()" class="space-y-4 max-w-md">
+  <div class="form-group required">
+    <label for="name">Name</label>
+    <input 
+      type="text" 
+      id="name" 
+      class="form-input" 
+      x-model="form.name"
+      @blur="validateName()"
+      :class="{ error: errors.name }"
+      required>
+    <div x-show="errors.name" class="form-error" x-text="errors.name"></div>
+  </div>
+
+  <div class="form-group required">
+    <label for="email">Email</label>
+    <input 
+      type="email" 
+      id="email" 
+      class="form-input" 
+      x-model="form.email"
+      @blur="validateEmail()"
+      :class="{ error: errors.email }"
+      required>
+    <div x-show="errors.email" class="form-error" x-text="errors.email"></div>
+  </div>
+
+  <div class="form-group required">
+    <label for="message">Message</label>
+    <textarea 
+      id="message" 
+      class="form-textarea auto-expand"
+      x-model="form.message"
+      @input="autoExpandTextarea($event)"
+      required
+      placeholder="Your message..."></textarea>
+  </div>
+
+  <div class="form-group">
+    <label class="flex items-center gap-3">
+      <input type="checkbox" class="form-checkbox" x-model="form.subscribe">
+      <span>Subscribe to our newsletter</span>
+    </label>
+  </div>
+
+  <button 
+    type="submit" 
+    class="btn btn-primary w-full" 
+    :disabled="isSubmitting">
+    <span x-show="isSubmitting" class="spinner mr-2"></span>
+    {{ isSubmitting ? 'Submitting...' : 'Send Message' }}
+  </button>
+</form>
+```
+
+---
+
+## Keyboard Shortcuts
+
+| Key | Action |
+|-----|--------|
+| Tab | Focus next form field |
+| Shift+Tab | Focus previous form field |
+| Space | Toggle checkbox/radio |
+| Enter | Submit form / Confirm dialog |
+| Escape | Close modal / Cancel dialog |
+| Arrow Up/Down | Navigate select options |
+
+---
+
+## Best Practices
+
+1. **Always use labels** — Associate with `for` attribute
+2. **Group related fields** — Use `.form-group` wrapper
+3. **Provide help text** — Use `.form-group-help` for guidance
+4. **Show errors clearly** — Use `.form-error` with specific messages
+5. **Test keyboard navigation** — Use Tab, Shift+Tab, Enter, Space, Escape
+6. **Verify contrast** — Check both dark and light modes
+7. **Respect motion preferences** — Use `prefers-reduced-motion` media query
+8. **Validate early** — Real-time feedback, but allow recovery
+9. **Disable during submission** — Prevent duplicate submissions
+10. **Use semantic HTML** — `<fieldset>`, `<legend>`, `<label>` elements
+
+---
+
+**Last Updated:** 2026-04-16  
+**Version:** 1.0