refactor(Index.tsx): remove unused AI tag generation button from current entry section

src/pages/Index.tsx

@@ -2092,22 +2092,6 @@ ${content}${context}`;
                     }}
                     className={`flex-1 border-0 bg-transparent ${getTextClass('base')} p-0 outline-none`}
                   />
-                {!autoGenerateTags && (
-                                      <Button
-                      onClick={async () => {
-                        if (currentNote.trim()) {
-                          addDebugInfo('Manually generating tags for current note...');
-                          const tags = await generateTags(currentNote, 0); // Current note context
-                          setCurrentNoteTags(tags);
-                        }
-                      }}
-                    size="sm"
-                    variant="outline"
-                    className={`${getTextClass('base')} px-2 py-1 h-6`}
-                  >
-                    AI
-                  </Button>
-                )}
                 </div>
             </div>
             <Textarea