Add clean button and functionality

Implement a "clean" button to delete signatures not in the pasted list.

src/pages/SystemView.tsx

@@ -1,10 +1,12 @@
 
 import { useParams, useNavigate } from "react-router-dom";
-import { useEffect } from "react";
+import { useEffect, useState } from "react";
 import { toast } from "@/hooks/use-toast";
 import { useQueryClient } from "@tanstack/react-query";
 import SystemTracker from "@/components/SystemTracker";
 import RegionMap from "@/components/RegionMap";
+import { Switch } from "@/components/ui/switch";
+import { Label } from "@/components/ui/label";
 import pb from "@/lib/pocketbase";
 
 interface Signature {
@@ -21,6 +23,7 @@ const SystemView = () => {
   const { system, region } = useParams();
   const navigate = useNavigate();
   const queryClient = useQueryClient();
+  const [cleanMode, setCleanMode] = useState(false);
 
   if (!system) {
     navigate("/");
@@ -90,6 +93,15 @@ const SystemView = () => {
     }
   };
 
+  const deleteSignature = async (signatureId: string): Promise<void> => {
+    try {
+      await pb.collection('signature').delete(signatureId);
+    } catch (error) {
+      console.error('Failed to delete signature:', error);
+      throw error;
+    }
+  };
+
   const handlePaste = async (e: ClipboardEvent) => {
     const pastedText = e.clipboardData?.getData('text');
     if (!pastedText?.trim()) return;
@@ -120,6 +132,24 @@ const SystemView = () => {
         return;
       }
 
+      // If clean mode is enabled, delete signatures not in the pasted list
+      if (cleanMode) {
+        const existingSignatures = await pb.collection('signature').getFullList({
+          filter: `system='${systemId}'`
+        });
+
+        const pastedIdentifiers = new Set(parsedSignatures.map(sig => sig.identifier));
+        const signaturesToDelete = existingSignatures.filter(sig => !pastedIdentifiers.has(sig.identifier));
+
+        for (const sig of signaturesToDelete) {
+          await deleteSignature(sig.id);
+        }
+
+        if (signaturesToDelete.length > 0) {
+          console.log(`Deleted ${signaturesToDelete.length} signatures not in pasted data`);
+        }
+      }
+
       // Save all new/updated signatures
       for (const signature of parsedSignatures) {
         await saveSignature(signature);
@@ -128,9 +158,10 @@ const SystemView = () => {
       // Invalidate queries to refresh the data
       queryClient.invalidateQueries({ queryKey: ['signatures', system] });
 
+      const cleanText = cleanMode ? ` (${cleanMode ? 'cleaned' : ''})` : '';
       toast({
         title: "Success",
-        description: `${parsedSignatures.length} signatures processed.`
+        description: `${parsedSignatures.length} signatures processed${cleanText}.`
       });
 
     } catch (error) {
@@ -148,14 +179,26 @@ const SystemView = () => {
     return () => {
       document.removeEventListener('paste', handlePaste);
     };
-  }, [system]);
+  }, [system, cleanMode]);
 
   return (
     <div className="min-h-screen bg-gradient-to-br from-slate-900 via-slate-800 to-slate-900">
       <div className="container mx-auto px-4 py-8">
         <div className="text-center mb-8">
           <h1 className="text-4xl font-bold text-white mb-2">System: {system}</h1>
-          <p className="text-slate-300">Viewing signatures and regional overview • Press Ctrl+V to paste signatures</p>
+          <div className="flex items-center justify-center gap-4 text-slate-300">
+            <p>Viewing signatures and regional overview • Press Ctrl+V to paste signatures</p>
+            <div className="flex items-center space-x-2">
+              <Switch 
+                id="clean-mode" 
+                checked={cleanMode} 
+                onCheckedChange={setCleanMode}
+              />
+              <Label htmlFor="clean-mode" className="text-sm text-slate-300">
+                Clean mode {cleanMode ? '(will delete missing signatures)' : ''}
+              </Label>
+            </div>
+          </div>
         </div>
         
         <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">