Add embedded web chat client with C2S HTTP API

- New DB schema: users, channel_members, messages tables (migration 003)
- Full C2S HTTP API: register, channels, messages, DMs, polling
- Preact SPA embedded via embed.FS, served at GET /
- IRC-style UI: tab bar, channel messages, user list, DM tabs, /commands
- Dark theme, responsive, esbuild-bundled (~19KB)
- Polling-based message delivery (1.5s interval)
- Commands: /join, /part, /msg, /nick

web/dist/app.js

@@ -0,0 +1 @@
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web/dist/index.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Chat</title>
+  <link rel="stylesheet" href="/style.css">
+</head>
+<body>
+  <div id="root"></div>
+  <script src="/app.js"></script>
+</body>
+</html>

web/dist/style.css

@@ -0,0 +1,274 @@
+* { margin: 0; padding: 0; box-sizing: border-box; }
+
+:root {
+  --bg: #1a1a2e;
+  --bg-secondary: #16213e;
+  --bg-input: #0f3460;
+  --text: #e0e0e0;
+  --text-muted: #888;
+  --accent: #e94560;
+  --accent2: #0f3460;
+  --border: #2a2a4a;
+  --nick: #53a8b6;
+  --timestamp: #666;
+  --tab-active: #e94560;
+  --tab-bg: #16213e;
+  --tab-hover: #1a1a3e;
+}
+
+html, body, #root {
+  height: 100%;
+  font-family: 'Courier New', Courier, monospace;
+  font-size: 14px;
+  background: var(--bg);
+  color: var(--text);
+}
+
+/* Login screen */
+.login-screen {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  height: 100%;
+  gap: 16px;
+}
+
+.login-screen h1 {
+  color: var(--accent);
+  font-size: 2em;
+}
+
+.login-screen input {
+  padding: 10px 16px;
+  font-size: 16px;
+  font-family: inherit;
+  background: var(--bg-input);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: 4px;
+  width: 280px;
+}
+
+.login-screen button {
+  padding: 10px 24px;
+  font-size: 16px;
+  font-family: inherit;
+  background: var(--accent);
+  border: none;
+  color: white;
+  border-radius: 4px;
+  cursor: pointer;
+}
+
+.login-screen .error {
+  color: var(--accent);
+}
+
+.login-screen .motd {
+  color: var(--text-muted);
+  max-width: 400px;
+  text-align: center;
+  white-space: pre-wrap;
+}
+
+/* Main layout */
+.app {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+}
+
+/* Tab bar */
+.tab-bar {
+  display: flex;
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border);
+  overflow-x: auto;
+  flex-shrink: 0;
+}
+
+.tab {
+  padding: 8px 16px;
+  cursor: pointer;
+  border-bottom: 2px solid transparent;
+  white-space: nowrap;
+  color: var(--text-muted);
+  user-select: none;
+}
+
+.tab:hover {
+  background: var(--tab-hover);
+}
+
+.tab.active {
+  color: var(--text);
+  border-bottom-color: var(--tab-active);
+}
+
+.tab .close-btn {
+  margin-left: 8px;
+  color: var(--text-muted);
+  font-size: 12px;
+}
+
+.tab .close-btn:hover {
+  color: var(--accent);
+}
+
+/* Content area */
+.content {
+  display: flex;
+  flex: 1;
+  overflow: hidden;
+}
+
+/* Messages */
+.messages-pane {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.messages {
+  flex: 1;
+  overflow-y: auto;
+  padding: 8px 12px;
+}
+
+.message {
+  padding: 2px 0;
+  line-height: 1.4;
+  word-wrap: break-word;
+}
+
+.message .timestamp {
+  color: var(--timestamp);
+  font-size: 12px;
+  margin-right: 8px;
+}
+
+.message .nick {
+  color: var(--nick);
+  font-weight: bold;
+  margin-right: 8px;
+}
+
+.message .nick::before { content: '<'; }
+.message .nick::after { content: '>'; }
+
+.message.system {
+  color: var(--text-muted);
+  font-style: italic;
+}
+
+.message.system .nick {
+  color: var(--text-muted);
+}
+
+.message.system .nick::before,
+.message.system .nick::after { content: ''; }
+
+/* Input */
+.input-bar {
+  display: flex;
+  border-top: 1px solid var(--border);
+  background: var(--bg-secondary);
+  flex-shrink: 0;
+}
+
+.input-bar input {
+  flex: 1;
+  padding: 10px 12px;
+  font-family: inherit;
+  font-size: 14px;
+  background: var(--bg-input);
+  border: none;
+  color: var(--text);
+  outline: none;
+}
+
+.input-bar button {
+  padding: 10px 16px;
+  font-family: inherit;
+  background: var(--accent);
+  border: none;
+  color: white;
+  cursor: pointer;
+}
+
+/* User list */
+.user-list {
+  width: 160px;
+  background: var(--bg-secondary);
+  border-left: 1px solid var(--border);
+  overflow-y: auto;
+  padding: 8px;
+  flex-shrink: 0;
+}
+
+.user-list h3 {
+  color: var(--text-muted);
+  font-size: 11px;
+  text-transform: uppercase;
+  margin-bottom: 8px;
+  letter-spacing: 1px;
+}
+
+.user-list .user {
+  padding: 3px 4px;
+  color: var(--nick);
+  font-size: 13px;
+  cursor: pointer;
+}
+
+.user-list .user:hover {
+  background: var(--tab-hover);
+}
+
+/* Server tab */
+.server-messages {
+  color: var(--text-muted);
+  padding: 12px;
+  white-space: pre-wrap;
+  overflow-y: auto;
+  flex: 1;
+}
+
+/* Channel join dialog */
+.join-dialog {
+  padding: 12px;
+  display: flex;
+  gap: 8px;
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border);
+}
+
+.join-dialog input {
+  padding: 6px 10px;
+  font-family: inherit;
+  font-size: 13px;
+  background: var(--bg-input);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: 3px;
+  width: 200px;
+}
+
+.join-dialog button {
+  padding: 6px 14px;
+  font-family: inherit;
+  font-size: 13px;
+  background: var(--accent2);
+  border: none;
+  color: var(--text);
+  border-radius: 3px;
+  cursor: pointer;
+}
+
+/* Responsive */
+@media (max-width: 600px) {
+  .user-list { display: none; }
+  .tab { padding: 6px 10px; font-size: 13px; }
+}