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/components/layout/project-setup-dialog.tsx

@@ -0,0 +1,114 @@
+"use client";
+
+import { Sparkles } from "lucide-react";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { Checkbox } from "@/components/ui/checkbox";
+
+interface ProjectSetupDialogProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  projectOverview: string;
+  onProjectOverviewChange: (value: string) => void;
+  generateFeatures: boolean;
+  onGenerateFeaturesChange: (value: boolean) => void;
+  onCreateSpec: () => void;
+  onSkip: () => void;
+  isCreatingSpec: boolean;
+}
+
+export function ProjectSetupDialog({
+  open,
+  onOpenChange,
+  projectOverview,
+  onProjectOverviewChange,
+  generateFeatures,
+  onGenerateFeaturesChange,
+  onCreateSpec,
+  onSkip,
+  isCreatingSpec,
+}: ProjectSetupDialogProps) {
+  return (
+    <Dialog
+      open={open}
+      onOpenChange={(open) => {
+        if (!open && !isCreatingSpec) {
+          onSkip();
+        }
+      }}
+    >
+      <DialogContent className="max-w-2xl">
+        <DialogHeader>
+          <DialogTitle>Set Up Your Project</DialogTitle>
+          <DialogDescription className="text-muted-foreground">
+            We didn&apos;t find an app_spec.txt file. Let us help you generate
+            your app_spec.txt to help describe your project for our system.
+            We&apos;ll analyze your project&apos;s tech stack and create a
+            comprehensive specification.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-4 py-4">
+          <div className="space-y-2">
+            <label className="text-sm font-medium">Project Overview</label>
+            <p className="text-xs text-muted-foreground">
+              Describe what your project does and what features you want to
+              build. Be as detailed as you want - this will help us create a
+              better specification.
+            </p>
+            <textarea
+              className="w-full h-48 p-3 rounded-md border border-border bg-background font-mono text-sm resize-none focus:outline-none focus:ring-2 focus:ring-ring"
+              value={projectOverview}
+              onChange={(e) => onProjectOverviewChange(e.target.value)}
+              placeholder="e.g., A project management tool that allows teams to track tasks, manage sprints, and visualize progress through kanban boards. It should support user authentication, real-time updates, and file attachments..."
+              autoFocus
+            />
+          </div>
+
+          <div className="flex items-start space-x-3 pt-2">
+            <Checkbox
+              id="sidebar-generate-features"
+              checked={generateFeatures}
+              onCheckedChange={(checked) =>
+                onGenerateFeaturesChange(checked === true)
+              }
+            />
+            <div className="space-y-1">
+              <label
+                htmlFor="sidebar-generate-features"
+                className="text-sm font-medium cursor-pointer"
+              >
+                Generate feature list
+              </label>
+              <p className="text-xs text-muted-foreground">
+                Automatically create features in the features folder from the
+                implementation roadmap after the spec is generated.
+              </p>
+            </div>
+          </div>
+        </div>
+
+        <DialogFooter>
+          <Button variant="ghost" onClick={onSkip}>
+            Skip for now
+          </Button>
+          <Button
+            onClick={onCreateSpec}
+            disabled={!projectOverview.trim()}
+          >
+            <Sparkles className="w-4 h-4 mr-2" />
+            Generate Spec
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}
+