fix(auth): clear stale credential error after github re-auth

The 401 flag and cached repo list were module-level and only reset
after a 20-min stale window, so re-authenticating left the
"credentials are invalid or expired" message pinned on. Watch the
access token: reset state and refetch on change. Also await
saveCredentials before redirecting so refs are settled.

src/components/AuthorizeUser.vue

@@ -19,8 +19,7 @@ onBeforeMount(async () => {
     if ("error" in token) {
       hasError.value = true
     } else {
-      token.access_token
-      saveCredentials(token)
+      await saveCredentials(token)
     }
 
     router.replace({ name: "Home" })

src/hooks/useRepos.hook.ts

@@ -1,4 +1,4 @@
-import { computed, ref } from "vue"
+import { computed, ref, watch } from "vue"
 
 import { useGitHubLogin } from "@/hooks/useGitHubLogin.hook"
 import { RepoBase } from "@/modules/repo/interfaces/RepoBase"
@@ -15,10 +15,19 @@ const currentPage = ref(0)
 const totalCount = ref(0)
 let lastFetchedAt = 0
 
-export const useRepos = () => {
-  const { username, accessToken } = useGitHubLogin()
+const { username, accessToken } = useGitHubLogin()
 
-  const loadMore = async () => {
+const resetState = () => {
+  repos.value = []
+  currentPage.value = 0
+  totalCount.value = 0
+  isReady.value = false
+  isLoading.value = false
+  hasCredentialError.value = false
+  lastFetchedAt = 0
+}
+
+const loadMore = async () => {
   if (!accessToken.value || !username.value) {
     isReady.value = true
     return
@@ -58,8 +67,18 @@ export const useRepos = () => {
     isReady.value = true
     isLoading.value = false
   }
-  }
+}
 
+watch(accessToken, (next, prev) => {
+  if (next === prev) return
+  resetState()
+  if (next && username.value) {
+    lastFetchedAt = Date.now()
+    loadMore()
+  }
+})
+
+export const useRepos = () => {
   const canLoadMore = computed(
     () => !isLoading.value && repos.value.length < totalCount.value
   )
@@ -67,12 +86,7 @@ export const useRepos = () => {
   const isStale = Date.now() - lastFetchedAt > STALE_TIME_MS
   if (!isReady.value || isStale) {
     if (isStale && isReady.value) {
-      repos.value = []
-      currentPage.value = 0
-      totalCount.value = 0
-      isReady.value = false
-      isLoading.value = false
-      hasCredentialError.value = false
+      resetState()
     }
     lastFetchedAt = Date.now()
     loadMore()