Phase 1: Backend basics - Complete Flask application with REST API

Implemented core backend functionality:
- Flask application structure with blueprints
- Configuration module loading from environment variables
- MeshCore CLI wrapper with subprocess execution and timeout handling
- Message parser for .msgs JSON Lines file format
- REST API endpoints (messages, status, sync, contacts cleanup)
- HTML views with Bootstrap 5 responsive design
- Frontend JavaScript with auto-refresh and live updates
- Custom CSS styling for chat interface

API Endpoints:
- GET  /api/messages - List messages with pagination
- POST /api/messages - Send message with optional reply-to
- GET  /api/status - Device connection status
- POST /api/sync - Trigger message sync
- POST /api/contacts/cleanup - Remove inactive contacts
- GET  /api/device/info - Device information

Features:
- Auto-refresh every 60s (configurable)
- Reply to messages with @[UserName] format
- Toast notifications for feedback
- Settings modal for contact management
- Responsive design (mobile-friendly)
- Message bubbles with sender, timestamp, SNR, hop count

Ready for testing on production server (192.168.131.80:5000)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/static/css/style.css

@@ -0,0 +1,186 @@
+/* mc-webui Custom Styles */
+
+:root {
+    --msg-own-bg: #e7f1ff;
+    --msg-other-bg: #f8f9fa;
+    --msg-border: #dee2e6;
+}
+
+/* Page Layout */
+html, body {
+    height: 100vh;
+    margin: 0;
+    overflow: hidden;
+}
+
+body {
+    display: flex;
+    flex-direction: column;
+}
+
+main {
+    flex: 1;
+    overflow: hidden;
+    display: flex;
+    flex-direction: column;
+}
+
+/* Messages Container */
+.messages-container {
+    background-color: #ffffff;
+}
+
+#messagesList {
+    display: flex;
+    flex-direction: column;
+    gap: 0.75rem;
+}
+
+/* Message Bubbles */
+.message {
+    max-width: 70%;
+    padding: 0.75rem 1rem;
+    border-radius: 1rem;
+    border: 1px solid var(--msg-border);
+    word-wrap: break-word;
+    animation: fadeIn 0.3s ease-in;
+}
+
+@keyframes fadeIn {
+    from { opacity: 0; transform: translateY(10px); }
+    to { opacity: 1; transform: translateY(0); }
+}
+
+/* Own Messages (right-aligned) */
+.message.own {
+    align-self: flex-end;
+    background-color: var(--msg-own-bg);
+    border-color: #b8daff;
+}
+
+/* Other Messages (left-aligned) */
+.message.other {
+    align-self: flex-start;
+    background-color: var(--msg-other-bg);
+}
+
+/* Message Header */
+.message-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 0.25rem;
+    font-size: 0.875rem;
+}
+
+.message-sender {
+    font-weight: 600;
+    color: #0d6efd;
+}
+
+.message.own .message-sender {
+    color: #084298;
+}
+
+.message-time {
+    font-size: 0.75rem;
+    color: #6c757d;
+}
+
+/* Message Content */
+.message-content {
+    margin: 0;
+    white-space: pre-wrap;
+    line-height: 1.4;
+}
+
+/* Message Metadata */
+.message-meta {
+    font-size: 0.7rem;
+    color: #adb5bd;
+    margin-top: 0.25rem;
+}
+
+/* Reply Button */
+.btn-reply {
+    font-size: 0.7rem;
+    padding: 0.1rem 0.4rem;
+    margin-top: 0.25rem;
+}
+
+/* Send Form */
+#messageInput {
+    resize: none;
+    border-radius: 0.5rem 0 0 0.5rem;
+}
+
+#sendBtn {
+    border-radius: 0 0.5rem 0.5rem 0;
+}
+
+/* Status Indicators */
+.status-connected {
+    color: #198754 !important;
+}
+
+.status-disconnected {
+    color: #dc3545 !important;
+}
+
+.status-connecting {
+    color: #ffc107 !important;
+}
+
+/* Scrollbar Styling */
+.messages-container::-webkit-scrollbar {
+    width: 8px;
+}
+
+.messages-container::-webkit-scrollbar-track {
+    background: #f1f1f1;
+}
+
+.messages-container::-webkit-scrollbar-thumb {
+    background: #888;
+    border-radius: 4px;
+}
+
+.messages-container::-webkit-scrollbar-thumb:hover {
+    background: #555;
+}
+
+/* Responsive Design */
+@media (max-width: 768px) {
+    .message {
+        max-width: 85%;
+    }
+
+    .message-header {
+        font-size: 0.8rem;
+    }
+
+    #messageInput {
+        font-size: 0.9rem;
+    }
+}
+
+/* Loading State */
+.loading-spinner {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 100%;
+}
+
+/* Empty State */
+.empty-state {
+    text-align: center;
+    padding: 3rem 1rem;
+    color: #6c757d;
+}
+
+.empty-state i {
+    font-size: 3rem;
+    margin-bottom: 1rem;
+    opacity: 0.5;
+}