fix(export): stretch format trigger

src/pages/ExportPage.scss

@@ -2877,6 +2877,17 @@
   margin-left: auto;
 }
 
+.dialog-format-trigger {
+  width: 100%;
+  justify-content: space-between;
+}
+
+.dialog-format-trigger-label {
+  flex: 1;
+  min-width: 0;
+  text-align: left;
+}
+
 .dialog-format-dropdown {
   position: absolute;
   top: calc(100% + 6px);

src/pages/ExportPage.tsx

@@ -6091,10 +6091,10 @@ function ExportPage() {
                       <div className="dialog-format-select" ref={sessionFormatDropdownRef}>
                         <button
                           type="button"
-                          className={`time-range-trigger ${showSessionFormatSelect ? 'open' : ''}`}
+                          className={`time-range-trigger dialog-format-trigger ${showSessionFormatSelect ? 'open' : ''}`}
                           onClick={() => setShowSessionFormatSelect(prev => !prev)}
                         >
-                          <span>{activeDialogFormatLabel}</span>
+                          <span className="dialog-format-trigger-label">{activeDialogFormatLabel}</span>
                           <span className="time-range-arrow">&gt;</span>
                         </button>
                         {showSessionFormatSelect && (