Add Import/Restore functionality for JSON backups

src/pages/Settings.tsx

@@ -4,6 +4,7 @@ import {
   Monitor,
   Trash2,
   Download,
+  Upload,
   FileSpreadsheet,
 } from "lucide-react";
 import { useAppStore } from "../stores/appStore";
@@ -35,6 +36,69 @@ export default function Settings() {
     }
   };
 
+  const handleImportJson = () => {
+    const input = document.createElement("input");
+    input.type = "file";
+    input.accept = "application/json";
+    input.onchange = async (e) => {
+      const file = (e.target as HTMLInputElement).files?.[0];
+      if (!file) return;
+
+      const reader = new FileReader();
+      reader.onload = async (event) => {
+        try {
+          const content = event.target?.result as string;
+          const data = JSON.parse(content);
+
+          if (!data.sessions || !data.settings || !data.players) {
+            throw new Error("Fichier de sauvegarde invalide ou corrompu.");
+          }
+
+          if (
+            window.confirm(
+              "Attention : L'importation va écraser vos données actuelles. Voulez-vous continuer ?",
+            )
+          ) {
+            await db.transaction(
+              "rw",
+              db.sessions,
+              db.settings,
+              db.players,
+              async () => {
+                await db.sessions.clear();
+                await db.settings.clear();
+                await db.players.clear();
+
+                if (data.sessions.length > 0)
+                  await db.sessions.bulkAdd(data.sessions);
+                if (data.settings.length > 0)
+                  await db.settings.bulkAdd(data.settings);
+                if (data.players.length > 0)
+                  await db.players.bulkAdd(data.players);
+              },
+            );
+
+            // Reload settings to apply any imported theme
+            const newSettings = await db.settings.get(1);
+            if (newSettings && newSettings.theme) {
+              setTheme(newSettings.theme);
+            }
+
+            alert("Restauration réussie !");
+            window.location.reload();
+          }
+        } catch (error) {
+          console.error(error);
+          alert(
+            "Échec de l'importation : Le fichier n'est pas un backup Skori valide.",
+          );
+        }
+      };
+      reader.readAsText(file);
+    };
+    input.click();
+  };
+
   const handleExportCSV = async () => {
     try {
       const sessions = await db.sessions.toArray();
@@ -162,23 +226,39 @@ export default function Settings() {
             </div>
           </Button>
 
-          <Button
-            variant="outline"
-            className="w-full justify-start h-auto py-4 px-6 border-0 shadow-md bg-background/90 backdrop-blur-md rounded-[1.5rem] hover:scale-[1.02] transition-transform"
-            onClick={handleExportJson}
-          >
-            <div className="flex flex-col items-start text-left w-full">
-              <span className="flex items-center font-black text-lg">
-                <div className="w-10 h-10 rounded-full bg-blue-500/20 flex items-center justify-center mr-4">
+          <div className="grid grid-cols-2 gap-3 mt-3">
+            <Button
+              variant="outline"
+              className="w-full justify-start h-auto py-3 px-4 border-0 shadow-md bg-background/90 backdrop-blur-md rounded-2xl hover:scale-[1.02] transition-transform"
+              onClick={handleExportJson}
+            >
+              <div className="flex flex-col items-center text-center w-full">
+                <div className="w-10 h-10 rounded-full bg-blue-500/20 flex items-center justify-center mb-2">
                   <Download className="w-5 h-5 text-blue-600" />
                 </div>
-                Sauvegarde complète (.json)
-              </span>
-              <span className="text-sm text-muted-foreground ml-14">
-                Copie brute de l'application
-              </span>
-            </div>
-          </Button>
+                <span className="font-bold text-sm">Sauvegarder</span>
+                <span className="text-[10px] text-muted-foreground mt-0.5">
+                  Format .json
+                </span>
+              </div>
+            </Button>
+
+            <Button
+              variant="outline"
+              className="w-full justify-start h-auto py-3 px-4 border-0 shadow-md bg-background/90 backdrop-blur-md rounded-2xl hover:scale-[1.02] transition-transform"
+              onClick={handleImportJson}
+            >
+              <div className="flex flex-col items-center text-center w-full">
+                <div className="w-10 h-10 rounded-full bg-purple-500/20 flex items-center justify-center mb-2">
+                  <Upload className="w-5 h-5 text-purple-600" />
+                </div>
+                <span className="font-bold text-sm">Restaurer</span>
+                <span className="text-[10px] text-muted-foreground mt-0.5">
+                  À partir d'un .json
+                </span>
+              </div>
+            </Button>
+          </div>
 
           <Button
             variant="outline"