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/components/ViewFileTreeStore.ts

@@ -57,9 +57,7 @@ export function createViewFileTreeStore(props: {repoLink: string, treePath: stri
       await store.loadViewContent(url);
     },
 
-    buildTreePathWebUrl(treePath: string) {
-      return `${props.repoLink}/src/${props.currentRefNameSubURL}/${pathEscapeSegments(treePath)}`;
-    },
+    buildTreePathWebUrl: (treePath: string) => `${props.repoLink}/src/${props.currentRefNameSubURL}/${pathEscapeSegments(treePath)}`,
   });
   return store;
 }