Add a democratic idea submission and AI synthesis platform

Implement a full-stack application with a React frontend and a Python Flask backend. The backend integrates with an AI agent to filter political ideas for democratic values and synthesize accepted ideas into a collective voice. Includes API endpoints for idea submission, retrieval, and synthesis, along with database persistence.

Replit-Commit-Author: Agent
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Replit-Commit-Event-Id: 31c5f770-9905-46af-a938-9d40ef3d4404
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artifacts/voix-du-peuple/src/hooks/use-mobile.tsx

@@ -0,0 +1,19 @@
+import * as React from "react"
+
+const MOBILE_BREAKPOINT = 768
+
+export function useIsMobile() {
+  const [isMobile, setIsMobile] = React.useState<boolean | undefined>(undefined)
+
+  React.useEffect(() => {
+    const mql = window.matchMedia(`(max-width: ${MOBILE_BREAKPOINT - 1}px)`)
+    const onChange = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    }
+    mql.addEventListener("change", onChange)
+    setIsMobile(window.innerWidth < MOBILE_BREAKPOINT)
+    return () => mql.removeEventListener("change", onChange)
+  }, [])
+
+  return !!isMobile
+}