feat: add database support, conversation sidebar, and improve chat streaming

- Update .gitignore to exclude database files, extensions, and .cursor directory
- Enhance chat streaming API with safe enqueue and close functions to prevent errors
- Integrate ConversationSidebar component into ClientHome for better UI
- Add dependencies like better-sqlite3 and esbuild packages for database functionality

This commit introduces database persistence for conversations, improves error handling in streaming responses, and adds a sidebar for managing chats, enhancing overall app robustness and user experience.

lib/embeddings.ts

@@ -0,0 +1,102 @@
+import { Ollama } from "ollama";
+
+const ollama = new Ollama({
+  host: process.env.OLLAMA_HOST || "http://localhost:11434",
+});
+
+export async function generateEmbedding(
+  text: string,
+  model: string = "nomic-embed-text"
+): Promise<Float32Array> {
+  try {
+    const response = await ollama.embeddings({
+      model,
+      prompt: text,
+    });
+
+    return new Float32Array(response.embedding);
+  } catch (error) {
+    console.error("Erro ao gerar embedding:", error);
+
+    // Fallback: retornar vetor zero se modelo não estiver disponível
+    console.warn(
+      `Modelo ${model} não disponível, usando vetor zero como fallback`
+    );
+    return new Float32Array(384); // 384 dimensões padrão
+  }
+}
+
+const EMOJI_CATEGORIES = {
+  code: ["💻", "🖥️", "⌨️", "🔧", "🛠️"],
+  idea: ["💡", "🧠", "💭", "🤔", "✨"],
+  question: ["❓", "🤷", "🔍", "🧐", "📚"],
+  creative: ["🎨", "🎭", "🎪", "🌈", "🎬"],
+  business: ["💼", "📊", "💰", "📈", "🏢"],
+  science: ["🔬", "🧪", "🔭", "⚗️", "🧬"],
+  education: ["📖", "📝", "🎓", "✏️", "📚"],
+  communication: ["💬", "📱", "📧", "🗣️", "💌"],
+  general: ["🌟", "🎯", "🚀", "⚡", "🔥"],
+};
+
+export async function generateChatTitle(firstMessage: string): Promise<string> {
+  try {
+    const response = await ollama.generate({
+      model: "qwen2.5:0.5b",
+      prompt: `Analise esta mensagem e crie um título curto e descritivo (MAX 30 caracteres, sem emoji):
+
+Mensagem: "${firstMessage}"
+
+Título (direto, sem explicação):`,
+      options: {
+        temperature: 0.7,
+        num_predict: 15,
+      },
+    });
+
+    let title = response.response
+      .trim()
+      .replace(/['"]/g, "")
+      .replace(/^Título:\s*/i, "")
+      .substring(0, 30);
+
+    // Selecionar emoji baseado no conteúdo
+    const emoji = selectEmoji(firstMessage);
+
+    return `${emoji} ${title}`;
+  } catch (error) {
+    console.error("Erro ao gerar título:", error);
+    // Fallback: usar título simples baseado no conteúdo
+    const emoji = selectEmoji(firstMessage);
+    const fallbackTitle = firstMessage.substring(0, 20).trim();
+    return `${emoji} ${fallbackTitle}`;
+  }
+}
+
+function selectEmoji(content: string): string {
+  const lower = content.toLowerCase();
+
+  if (/code|program|debug|function|class/.test(lower))
+    return EMOJI_CATEGORIES.code[
+      Math.floor(Math.random() * EMOJI_CATEGORIES.code.length)
+    ];
+  if (/why|how|what|when|where/.test(lower))
+    return EMOJI_CATEGORIES.question[
+      Math.floor(Math.random() * EMOJI_CATEGORIES.question.length)
+    ];
+  if (/idea|think|create|design/.test(lower))
+    return EMOJI_CATEGORIES.idea[
+      Math.floor(Math.random() * EMOJI_CATEGORIES.idea.length)
+    ];
+  if (/business|money|sale|market/.test(lower))
+    return EMOJI_CATEGORIES.business[
+      Math.floor(Math.random() * EMOJI_CATEGORIES.business.length)
+    ];
+  if (/science|research|experiment/.test(lower))
+    return EMOJI_CATEGORIES.science[
+      Math.floor(Math.random() * EMOJI_CATEGORIES.science.length)
+    ];
+
+  return EMOJI_CATEGORIES.general[
+    Math.floor(Math.random() * EMOJI_CATEGORIES.general.length)
+  ];
+}