misc: provider icons, tooltip in chat toolbar, conditionally display the "Open Skills Folder" button and update "Documentation" to "Website" in settings (#60)

src/pages/Chat/ChatInput.tsx

@@ -5,7 +5,7 @@
  * Supports: file picker, clipboard paste, drag & drop.
  */
 import { useState, useRef, useEffect, useCallback } from 'react';
-import { Send, Square, ImagePlus, X } from 'lucide-react';
+import { Send, Square, X } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import { Textarea } from '@/components/ui/textarea';
 
@@ -200,18 +200,7 @@ export function ChatInput({ onSend, onStop, disabled = false, sending = false }:
 
         {/* Input Row */}
         <div className={`flex items-end gap-2 ${dragOver ? 'ring-2 ring-primary rounded-lg' : ''}`}>
-          {/* Image Upload Button */}
-          <Button
-            type="button"
-            variant="ghost"
-            size="icon"
-            className="shrink-0 h-[44px] w-[44px] text-muted-foreground hover:text-foreground"
-            onClick={() => fileInputRef.current?.click()}
-            disabled={disabled}
-            title="Attach image"
-          >
-            <ImagePlus className="h-5 w-5" />
-          </Button>
+
           <input
             ref={fileInputRef}
             type="file"