Polished version selector dropdown behavior

- **Removed 'Choose version' text** on root version selector page (redundant)
- **Smart version switching** preserves current location when changing versions
- **Context-aware navigation** replaces version in URL to keep same chapter/book
- **Improved UX** users can switch ESV↔NKJV without losing their place

Version dropdown now intelligently keeps users where they are when switching translations!

frontend/src/App.tsx

@@ -415,7 +415,13 @@ function App() {
                 {selectedVersion ? (
                   <select
                     value={selectedVersion}
-                    onChange={(e) => navigate(`/version/${e.target.value}`)}
+                    onChange={(e) => {
+                      const currentPath = location.pathname;
+                      const newVersion = e.target.value;
+                      // Replace current version in path with new version to keep same page
+                      const newPath = currentPath.replace(`/version/${selectedVersion}`, `/version/${newVersion}`);
+                      navigate(newPath);
+                    }}
                     className="text-xs text-gray-600 dark:text-gray-400 bg-transparent border-none focus:outline-none cursor-pointer hover:text-blue-600 dark:hover:text-blue-400"
                   >
                     {availableVersions.map((version) => (
@@ -424,11 +430,7 @@ function App() {
                       </option>
                     ))}
                   </select>
-                ) : (
-                  <span className="text-xs text-gray-500 dark:text-gray-500 italic">
-                    Choose version
-                  </span>
-                )}
+                ) : null}
               </div>
             </div>