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/dropzone.ts

@@ -110,8 +110,8 @@ export async function initDropzone(dropzoneEl: HTMLElement) {
   });
 
   dzInst.on('submit', () => {
-    for (const fileUuid of Object.keys(fileUuidDict)) {
-      fileUuidDict[fileUuid].submitted = true;
+    for (const value of Object.values(fileUuidDict)) {
+      value.submitted = true;
     }
   });