Add hover tooltips explaining simplify and store options

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/pages/UploadPage.tsx

@@ -392,7 +392,10 @@ export function UploadPage() {
                     </select>
                   </label>
 
-                  <label className={styles.option}>
+                  <label
+                    className={styles.option}
+                    title="Many StepMania charts require stepping in two directions at once. Since this game uses body tracking (not a dance pad), only one step can be detected at a time. Simplify removes simultaneous arrows so every note is hittable."
+                  >
                     <input
                       type="checkbox"
                       checked={bundle.simplify}
@@ -408,7 +411,10 @@ export function UploadPage() {
           </div>
 
           <div className={styles.actions}>
-            <label className={styles.option}>
+            <label
+              className={styles.option}
+              title="Saves the song files to your browser's local storage so they persist across sessions. Without this, uploaded tracks are lost when you close the tab. Uses disk space on this device."
+            >
               <input
                 type="checkbox"
                 checked={storeInBrowser}