feat: implement project setup dialog and refactor sidebar integration

- Added a new ProjectSetupDialog component to facilitate project specification generation, enhancing user experience by guiding users through project setup.
- Refactored the Sidebar component to integrate the new ProjectSetupDialog, replacing the previous inline dialog implementation for improved code organization and maintainability.
- Updated the sidebar to handle project overview and feature generation options, streamlining the project setup process.
- Removed the old dialog implementation from the Sidebar, reducing code duplication and improving clarity.

apps/app/src/config/model-config.ts

@@ -0,0 +1,93 @@
+/**
+ * Model Configuration - Centralized model settings for the app
+ *
+ * Models can be overridden via environment variables:
+ * - AUTOMAKER_MODEL_CHAT: Model for chat interactions
+ * - AUTOMAKER_MODEL_DEFAULT: Fallback model for all operations
+ */
+
+/**
+ * Claude model aliases for convenience
+ */
+export const CLAUDE_MODEL_MAP: Record<string, string> = {
+  haiku: "claude-haiku-4-5",
+  sonnet: "claude-sonnet-4-20250514",
+  opus: "claude-opus-4-5-20251101",
+} as const;
+
+/**
+ * Default models per use case
+ */
+export const DEFAULT_MODELS = {
+  chat: "claude-opus-4-5-20251101",
+  default: "claude-opus-4-5-20251101",
+} as const;
+
+/**
+ * Resolve a model alias to a full model string
+ */
+export function resolveModelString(
+  modelKey?: string,
+  defaultModel: string = DEFAULT_MODELS.default
+): string {
+  if (!modelKey) {
+    return defaultModel;
+  }
+
+  // Full Claude model string - pass through
+  if (modelKey.includes("claude-")) {
+    return modelKey;
+  }
+
+  // Check alias map
+  const resolved = CLAUDE_MODEL_MAP[modelKey];
+  if (resolved) {
+    return resolved;
+  }
+
+  // Unknown key - use default
+  return defaultModel;
+}
+
+/**
+ * Get the model for chat operations
+ *
+ * Priority:
+ * 1. Explicit model parameter
+ * 2. AUTOMAKER_MODEL_CHAT environment variable
+ * 3. AUTOMAKER_MODEL_DEFAULT environment variable
+ * 4. Default chat model
+ */
+export function getChatModel(explicitModel?: string): string {
+  if (explicitModel) {
+    return resolveModelString(explicitModel);
+  }
+
+  const envModel =
+    process.env.AUTOMAKER_MODEL_CHAT || process.env.AUTOMAKER_MODEL_DEFAULT;
+
+  if (envModel) {
+    return resolveModelString(envModel);
+  }
+
+  return DEFAULT_MODELS.chat;
+}
+
+/**
+ * Default allowed tools for chat interactions
+ */
+export const CHAT_TOOLS = [
+  "Read",
+  "Write",
+  "Edit",
+  "Glob",
+  "Grep",
+  "Bash",
+  "WebSearch",
+  "WebFetch",
+] as const;
+
+/**
+ * Default max turns for chat
+ */
+export const CHAT_MAX_TURNS = 1000;