fix(frontend): initializeStores dedup + retryAllMessages guard + as any cleanup

- index.ts: add _storesInitialized guard to prevent triple initialization
- offlineStore.ts: add isRetrying mutex for retryAllMessages concurrency
- PropertyPanel.tsx: replace 13x (data as any) with typed d accessor
- chatStore.ts: replace window as any with Record<string, unknown>
- kernel-*.ts: replace prototype as any with Record<string, unknown>
- gateway-heartbeat.ts: delete dead code (9 as any, zero imports)

desktop/src/components/WorkflowBuilder/PropertyPanel.tsx

@@ -87,6 +87,8 @@ function renderTypeSpecificFields(
   data: Partial<WorkflowNodeData>,
   onChange: (field: string, value: unknown) => void
 ) {
+  // Type-safe property accessor for union-typed node data
+  const d = data as Record<string, unknown>;
   switch (type) {
     case 'input':
       return (
@@ -97,7 +99,7 @@ function renderTypeSpecificFields(
             </label>
             <input
               type="text"
-              value={(data as any).variableName || ''}
+              value={d.variableName || ''}
               onChange={(e) => onChange('variableName', e.target.value)}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg font-mono"
             />
@@ -107,7 +109,7 @@ function renderTypeSpecificFields(
               Default Value
             </label>
             <textarea
-              value={(data as any).defaultValue || ''}
+              value={d.defaultValue || ''}
               onChange={(e) => {
                 try {
                   const parsed = JSON.parse(e.target.value);
@@ -132,7 +134,7 @@ function renderTypeSpecificFields(
               Template
             </label>
             <textarea
-              value={(data as any).template || ''}
+              value={d.template || ''}
               onChange={(e) => onChange('template', e.target.value)}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg font-mono text-sm"
               rows={6}
@@ -144,7 +146,7 @@ function renderTypeSpecificFields(
             </label>
             <input
               type="text"
-              value={(data as any).model || ''}
+              value={d.model || ''}
               onChange={(e) => onChange('model', e.target.value)}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg"
               placeholder="e.g., gpt-4"
@@ -159,7 +161,7 @@ function renderTypeSpecificFields(
               min="0"
               max="2"
               step="0.1"
-              value={(data as any).temperature ?? ''}
+              value={d.temperature ?? ''}
               onChange={(e) => onChange('temperature', parseFloat(e.target.value))}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg"
             />
@@ -167,7 +169,7 @@ function renderTypeSpecificFields(
           <div className="flex items-center gap-2">
             <input
               type="checkbox"
-              checked={(data as any).jsonMode || false}
+              checked={d.jsonMode || false}
               onChange={(e) => onChange('jsonMode', e.target.checked)}
               className="w-4 h-4 text-blue-600 rounded"
             />
@@ -185,7 +187,7 @@ function renderTypeSpecificFields(
             </label>
             <input
               type="text"
-              value={(data as any).skillId || ''}
+              value={d.skillId || ''}
               onChange={(e) => onChange('skillId', e.target.value)}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg font-mono"
             />
@@ -195,7 +197,7 @@ function renderTypeSpecificFields(
               Input Mappings (JSON)
             </label>
             <textarea
-              value={JSON.stringify((data as any).inputMappings || {}, null, 2)}
+              value={JSON.stringify(d.inputMappings || {}, null, 2)}
               onChange={(e) => {
                 try {
                   const parsed = JSON.parse(e.target.value);
@@ -220,7 +222,7 @@ function renderTypeSpecificFields(
             </label>
             <input
               type="text"
-              value={(data as any).handId || ''}
+              value={d.handId || ''}
               onChange={(e) => onChange('handId', e.target.value)}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg font-mono"
             />
@@ -231,7 +233,7 @@ function renderTypeSpecificFields(
             </label>
             <input
               type="text"
-              value={(data as any).action || ''}
+              value={d.action || ''}
               onChange={(e) => onChange('action', e.target.value)}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg"
             />
@@ -251,9 +253,9 @@ function renderTypeSpecificFields(
                 <label key={format} className="flex items-center gap-2">
                   <input
                     type="checkbox"
-                    checked={((data as any).formats || []).includes(format)}
+                    checked={(d.formats || []).includes(format)}
                     onChange={(e) => {
-                      const formats = (data as any).formats || [];
+                      const formats = d.formats || [];
                       if (e.target.checked) {
                         onChange('formats', [...formats, format]);
                       } else {
@@ -273,7 +275,7 @@ function renderTypeSpecificFields(
             </label>
             <input
               type="text"
-              value={(data as any).outputDir || ''}
+              value={d.outputDir || ''}
               onChange={(e) => onChange('outputDir', e.target.value)}
               className="w-full px-3 py-2 border border-gray-300 rounded-lg"
               placeholder="./output"