Modernize kaomoji picker: modal popup with categorized tabs

KAOMOJI_MODAL_FEATURE.md

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+# Kaomoji Modal Popup Feature
+
+## Overview
+The kaomoji (emoticon) picker has been redesigned as a modern modal popup with categorized tabs, similar to emoticon pickers in popular chat applications like WeChat, QQ, and Telegram.
+
+## Features
+
+### 1. **Modal Popup Design**
+- Full-screen semi-transparent overlay
+- Centered popup window with modern Material Design styling
+- Smooth animations and transitions
+- Click outside to close functionality
+- Close button (×) in the header
+
+### 2. **Categorized Tabs**
+The kaomoji are organized into 9 categories:
+- **常用** (Common) - Frequently used emoticons
+- **躲** (Hide) - Hiding/peeking emoticons
+- **拳** (Fist) - Action emoticons
+- **∀** (A) - Happy/cheerful emoticons
+- **д** (D) - Surprised/shocked emoticons
+- **ω** (W) - Cute emoticons
+- **ー** (Dash) - Cool/indifferent emoticons
+- **ε** (E) - Kiss emoticons
+- **其他** (Other) - Miscellaneous emoticons
+
+### 3. **User Experience**
+- Click the "😊 Kaomoji" button to open the modal
+- Navigate between categories using tabs
+- Click any emoticon to insert it at the cursor position
+- The modal automatically closes after inserting an emoticon
+- Responsive design works on mobile and desktop
+
+## Technical Implementation
+
+### CSS Classes
+- `.kaomoji-modal` - Full-screen overlay
+- `.kaomoji-popup` - Centered popup window
+- `.kaomoji-header` - Header with title and close button
+- `.kaomoji-tabs` - Tab navigation bar
+- `.kaomoji-tab` - Individual tab button (`.active` for current tab)
+- `.kaomoji-content` - Content area with scrolling
+- `.kaomoji-category` - Category container (`.active` for visible category)
+- `.kaomoji-items` - Grid layout for emoticons
+- `.kaomoji-item` - Individual emoticon button
+
+### JavaScript Functions
+- `openKaomoji()` - Opens the modal
+- `closeKaomoji()` - Closes the modal
+- `switchTab(index)` - Switches between categories
+- `insertKaomoji(kaomoji)` - Inserts emoticon at cursor position
+
+### Responsive Breakpoints
+- **Desktop** (>768px): 600px max-width popup, larger emoticons
+- **Mobile** (≤768px): 95% width popup, optimized touch targets
+
+## Design Highlights
+1. **Material Design**: Follows Google Material Design principles
+2. **Accessibility**: High contrast, clear focus states, keyboard-friendly
+3. **Performance**: Pure CSS/JavaScript, no external libraries
+4. **Mobile-First**: Touch-friendly buttons and scrollable content
+5. **Visual Feedback**: Hover effects, active states, smooth transitions
+
+## Usage Locations
+The kaomoji modal is available in:
+- New thread creation form (`/board?id=X`)
+- Reply form in thread view (`/thread?id=X`)
+
+## Benefits Over Previous Design
+1. **More Space**: Modal provides more screen space for emoticons
+2. **Better Organization**: Tab-based navigation is more intuitive
+3. **Modern UI**: Matches current chat application standards
+4. **Better Mobile UX**: Full-screen modal works better on small screens
+5. **Less Clutter**: Doesn't take up space in the form when not in use
+
+## Browser Compatibility
+- Modern browsers (Chrome, Firefox, Safari, Edge)
+- CSS Flexbox support required
+- JavaScript ES5+ required