chore(frontend): remove dead needsOAuth computed properties

Both ServerCard.vue and ServerDetail.vue now use healthAction from the
unified health status. The needsOAuth computed properties were no longer
referenced anywhere and can be safely removed.

Author: technicalpickles

frontend/src/components/ServerCard.vue

@@ -269,54 +269,6 @@ const healthAction = computed(() => {
   return props.server.health?.action || ''
 })
 
-const needsOAuth = computed(() => {
-  // Don't show Login button if server is disabled
-  if (!props.server.enabled) return false
-
-  // Don't show Login button while connecting (let the connection attempt finish)
-  if (props.server.connecting) return false
-
-  if (!isHttpProtocol.value) return false
-
-  // Don't show Login if already connected
-  if (props.server.connected) return false
-
-  // HTTP servers always support OAuth via autodiscovery, even without explicit oauth config
-  // oauth: null (new server) and oauth: {} (explicit empty config) should both allow Login
-  // Only require explicit oauth config for non-HTTP protocols (though they don't reach here)
-  const hasOAuthSupport = isHttpProtocol.value || (props.server.oauth !== null && props.server.oauth !== undefined)
-  if (!hasOAuthSupport) return false
-
-  // Show Login if user explicitly logged out
-  if (props.server.user_logged_out) {
-    return true
-  }
-
-  // Use oauth_status for more accurate token state detection
-  // Show Login if: no token, expired token, or error state
-  const oauthStatus = props.server.oauth_status
-  if (oauthStatus === 'expired' || oauthStatus === 'error' || oauthStatus === 'none') {
-    return true
-  }
-
-  // Fallback: if oauth_status not available, use authenticated flag
-  // Show Login if not authenticated (no stored token)
-  if (!props.server.authenticated) {
-    return true
-  }
-
-  // Check for OAuth-related errors that indicate re-authentication is needed
-  const hasOAuthError = props.server.last_error && (
-    props.server.last_error.includes('authorization') ||
-    props.server.last_error.includes('OAuth') ||
-    props.server.last_error.includes('401') ||
-    props.server.last_error.includes('invalid_token') ||
-    props.server.last_error.includes('Missing or invalid access token')
-  )
-
-  return hasOAuthError
-})
-
 const canLogout = computed(() => {
   // Don't show Logout button if server is disabled
   if (!props.server.enabled) return false

frontend/src/views/ServerDetail.vue

@@ -470,14 +470,6 @@ const isHttpProtocol = computed(() => {
   return server.value?.protocol === 'http' || server.value?.protocol === 'streamable-http'
 })
 
-const needsOAuth = computed(() => {
-  return server.value &&
-         isHttpProtocol.value &&
-         !server.value.connected &&
-         server.value.enabled &&
-         server.value.last_error?.includes('authorization')
-})
-
 // Suggested action from unified health status
 const healthAction = computed(() => {
   return server.value?.health?.action || ''