Prevent navigation keys from triggering actions during IME composition (#36540)

Fixes  #36532 

Refined the Enter key trigger logic in the repository filter to prevent
actions during IME composition.

By checking the e.isComposing property, the filter now correctly
distinguishes between "confirming an IME candidate" and "submitting the
search." This prevents premature search triggers when users press Enter
to select Chinese/Japanese characters.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/common-form.ts

@@ -14,6 +14,7 @@ export function initGlobalFormDirtyLeaveConfirm() {
 
 export function initGlobalEnterQuickSubmit() {
   document.addEventListener('keydown', (e) => {
+    if (e.isComposing) return;
     if (e.key !== 'Enter') return;
     const hasCtrlOrMeta = ((e.ctrlKey || e.metaKey) && !e.altKey);
     if (hasCtrlOrMeta && (e.target as HTMLElement).matches('textarea')) {

web_src/js/features/comp/EditorMarkdown.ts

@@ -223,6 +223,7 @@ function isTextExpanderShown(textarea: HTMLElement): boolean {
 
 export function initTextareaMarkdown(textarea: HTMLTextAreaElement) {
   textarea.addEventListener('keydown', (e) => {
+    if (e.isComposing) return;
     if (isTextExpanderShown(textarea)) return;
     if (e.key === 'Tab' && !e.ctrlKey && !e.metaKey && !e.altKey) {
       // use Tab/Shift-Tab to indent/unindent the selected lines

web_src/js/features/repo-issue.ts

@@ -82,6 +82,7 @@ function initRepoIssueLabelFilter(elDropdown: HTMLElement) {
   });
   // alt(or option) + enter to exclude selected label
   elDropdown.addEventListener('keydown', (e: KeyboardEvent) => {
+    if (e.isComposing) return;
     if (e.altKey && e.key === 'Enter') {
       const selectedItem = elDropdown.querySelector('.label-filter-query-item.selected');
       if (selectedItem) excludeLabel(e, selectedItem);