refactor: add typings to +page.ts

as a tidy up activity

src/routes/repo/[repo_id]/+page.ts

@@ -1,4 +1,4 @@
-export const load = ({ params }) => {
+export const load = ({ params }: { params: { repo_id: string } }) => {
   return {
     repo_id: decodeURIComponent(params.repo_id),
   }

src/routes/repo/[repo_id]/proposal/[proposal_id]/+page.ts

@@ -1,4 +1,8 @@
-export const load = ({ params }) => {
+export const load = ({
+  params,
+}: {
+  params: { proposal_id: string; repo_id: string }
+}) => {
   return {
     repo_id: decodeURIComponent(params.repo_id),
     proposal_id: params.proposal_id,