Refactor issue sidebar and fix various problems (#37045)

Fix various legacy problems, including:

* Don't create default column when viewing an empty project
* Fix layouts for Windows
* Fix (partially) #15509
* Fix (partially) #17705

The sidebar refactoring: it is a clear partial-reloading approach,
brings better user experiences, and it makes "Multiple projects" /
"Project column on issue sidebar" feature easy to be added.

---------

Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/index.ts

@@ -21,7 +21,7 @@ import {initRepoFileSearch} from './features/repo-findfile.ts';
 import {initMarkupContent} from './markup/content.ts';
 import {initRepoFileView} from './features/file-view.ts';
 import {initUserAuthOauth2, initUserCheckAppUrl} from './features/user-auth.ts';
-import {initRepoPullRequestAllowMaintainerEdit, initRepoPullRequestReview, initRepoIssueSidebarDependency, initRepoIssueFilterItemLabel} from './features/repo-issue.ts';
+import {initRepoPullRequestReview, initRepoIssueFilterItemLabel} from './features/repo-issue.ts';
 import {initRepoEllipsisButton, initCommitStatuses} from './features/repo-commit.ts';
 import {initRepoTopicBar} from './features/repo-home.ts';
 import {initAdminCommon} from './features/admin/common.ts';
@@ -130,11 +130,9 @@ const initPerformanceTracer = callInitFunctions([
   initRepoIssueContentHistory,
   initRepoIssueList,
   initRepoIssueFilterItemLabel,
-  initRepoIssueSidebarDependency,
   initRepoMigration,
   initRepoMigrationStatusChecker,
   initRepoProject,
-  initRepoPullRequestAllowMaintainerEdit,
   initRepoPullRequestReview,
   initRepoReleaseNew,
   initRepoTopicBar,