chore: upgrade eslint plugins, remove eslint-plugin-github (#38046)

- Bump `eslint`, `typescript-eslint` and `eslint-plugin-unicorn` (to
v68), and configure the rules added in unicorn v66/v67/v68.
- Remove `eslint-plugin-github` and its workarounds (rules, type stub,
pnpm peer override, in-code `eslint-disable` comments); the rules worth
keeping are covered by `unicorn` equivalents.
- Apply the resulting fixes and autofixes across the JS codebase.

_Prepared with Claude (Opus 4.8)._

---------

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

web_src/js/features/notification.ts

@@ -10,7 +10,7 @@ async function receiveUpdateCount(event: MessageEvent<{type: string, data: strin
     const data = JSON.parse(event.data.data);
     for (const count of document.querySelectorAll('.notification_count')) {
       count.classList.toggle('tw-hidden', data.Count === 0);
-      count.textContent = `${data.Count}`;
+      count.textContent = String(data.Count);
     }
     await updateNotificationTable();
   } catch (error) {
@@ -112,7 +112,7 @@ async function updateNotificationCount(): Promise<number> {
     toggleElem('.notification_count', data.new !== 0);
 
     for (const el of document.querySelectorAll('.notification_count')) {
-      el.textContent = `${data.new}`;
+      el.textContent = String(data.new);
     }
 
     return data.new as number;