chore(desktop): zero eslint/typecheck debt + prettier pass (#39100)

- eslint --fix across src/ and electron/ (unused imports, import/prop sort, padding)
- flatten empty catch blocks in electron CJS; drop unused applyUpdatesPosixInApp arg
- add setMutableRef helper for imperative ref writes (react-compiler clean)
- move sidebar cookie persistence into an effect; extract scrollElementToBottom helper

apps/desktop/src/components/model-picker.tsx

@@ -185,6 +185,7 @@ function ModelResults({
   }
 
   const q = search.trim().toLowerCase()
+
   const matches = (provider: ModelOptionProvider, model: string) =>
     !q ||
     model.toLowerCase().includes(q) ||