feat: Update frontend file validation to accept MD, DOC, TXT, and HTML formats

- Update IndexForm.tsx to accept .md, .doc, .txt, .html, .htm file extensions
- Update IndexWizard.tsx file input accept attribute for new formats
- Update chat-input.tsx validation logic to handle new MIME types and extensions
- Update empty-chat-state.tsx validation logic for comprehensive file support
- Update test-upload.html to accept all supported file formats
- Resolves frontend file upload restrictions for unstructured document formats

Co-Authored-By: PromptEngineer <jnfarooq@outlook.com>

src/components/IndexForm.tsx

@@ -99,7 +99,7 @@ export function IndexForm({ onClose, onIndexed }: Props) {
           >
             <svg width="32" height="32" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" className="mb-2 text-white/80"><path d="M4 16v2a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-2"/><polyline points="7 10 12 5 17 10"/><line x1="12" y1="5" x2="12" y2="16"/></svg>
             <span className="text-xs text-gray-400">Drag & Drop documents here or click to browse</span>
-            <input id="file-upload" type="file" accept="application/pdf,.docx,.html,.htm" multiple className="hidden" onChange={(e)=>setFiles(e.target.files)} />
+            <input id="file-upload" type="file" accept="application/pdf,.docx,.doc,.html,.htm,.md,.txt" multiple className="hidden" onChange={(e)=>setFiles(e.target.files)} />
           </label>
           {files && <p className="mt-1 text-xs text-green-400">{files.length} file(s) selected</p>}
         </div>
@@ -220,4 +220,4 @@ export function IndexForm({ onClose, onIndexed }: Props) {
       </div>
     </div>
   );
-}            
+}                        

src/components/IndexWizard.tsx

@@ -25,7 +25,7 @@ export function IndexWizard({ onClose }: Props) {
         <div className="space-y-4">
           <div>
             <label className="block text-sm mb-1">Document files</label>
-            <input type="file" accept="application/pdf,.docx,.html,.htm" multiple onChange={handleFile} className="text-sm" />
+            <input type="file" accept="application/pdf,.docx,.doc,.html,.htm,.md,.txt" multiple onChange={handleFile} className="text-sm" />
           </div>
 
           <div className="grid grid-cols-2 gap-4">
@@ -69,4 +69,4 @@ export function IndexWizard({ onClose }: Props) {
       </div>
     </div>
   );
-}  
+}    

src/components/ui/chat-input.tsx

@@ -91,10 +91,17 @@ export function ChatInput({
       
       if (file.type === 'application/pdf' || 
           file.type === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' ||
+          file.type === 'application/msword' ||
           file.type === 'text/html' ||
+          file.type === 'text/markdown' ||
+          file.type === 'text/plain' ||
+          file.name.toLowerCase().endsWith('.pdf') ||
+          file.name.toLowerCase().endsWith('.docx') ||
+          file.name.toLowerCase().endsWith('.doc') ||
           file.name.toLowerCase().endsWith('.html') ||
           file.name.toLowerCase().endsWith('.htm') ||
-          file.name.toLowerCase().endsWith('.docx')) {
+          file.name.toLowerCase().endsWith('.md') ||
+          file.name.toLowerCase().endsWith('.txt')) {
         newFiles.push({
           id: crypto.randomUUID(),
           name: file.name,
@@ -157,7 +164,7 @@ export function ChatInput({
 
         <div className="bg-white/5 backdrop-blur border border-white/10 rounded-2xl px-5 pt-4 pb-3 space-y-2">
           {/* Hidden file input (kept for future use) */}
-          <input ref={fileInputRef} type="file" accept=".pdf,.docx,.html,.htm" multiple onChange={handleFileChange} className="hidden" />
+          <input ref={fileInputRef} type="file" accept=".pdf,.docx,.doc,.html,.htm,.md,.txt" multiple onChange={handleFileChange} className="hidden" />
 
           {/* Textarea */}
           <textarea
@@ -204,4 +211,4 @@ export function ChatInput({
       </form>
     </div>
   )
-}  
+}    

src/components/ui/empty-chat-state.tsx

@@ -117,10 +117,17 @@ export function EmptyChatState({
             const file = files[i];
             if (file.type === 'application/pdf' || 
                 file.type === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' ||
+                file.type === 'application/msword' ||
                 file.type === 'text/html' ||
+                file.type === 'text/markdown' ||
+                file.type === 'text/plain' ||
+                file.name.toLowerCase().endsWith('.pdf') ||
+                file.name.toLowerCase().endsWith('.docx') ||
+                file.name.toLowerCase().endsWith('.doc') ||
                 file.name.toLowerCase().endsWith('.html') ||
                 file.name.toLowerCase().endsWith('.htm') ||
-                file.name.toLowerCase().endsWith('.docx')) {
+                file.name.toLowerCase().endsWith('.md') ||
+                file.name.toLowerCase().endsWith('.txt')) {
                 newFiles.push({
                     id: crypto.randomUUID(),
                     name: file.name,
@@ -224,7 +231,7 @@ export function EmptyChatState({
                     <input
                         ref={fileInputRef}
                         type="file"
-                        accept=".pdf,.docx,.html,.htm"
+                        accept=".pdf,.docx,.doc,.html,.htm,.md,.txt"
                         multiple
                         onChange={handleFileChange}
                         className="hidden"
@@ -282,4 +289,4 @@ export function EmptyChatState({
             </div>
         </div>
     );
-}  
+}    

src/test-upload.html

@@ -6,7 +6,7 @@
 <body>
     <h1>Test PDF Upload</h1>
     <form id="uploadForm">
-        <input type="file" id="fileInput" accept=".pdf,.docx,.html,.htm" />
+        <input type="file" id="fileInput" accept=".pdf,.docx,.doc,.html,.htm,.md,.txt" />
         <button type="submit">Upload PDF</button>
     </form>
     
@@ -51,4 +51,4 @@
         });
     </script>
 </body>
-</html>  
+</html>