fix(slack): request reactions:read in OAuth URL, drop im:history (#4856)

* fix(slack): request reactions:read in OAuth URL, drop im:history

* chore(slack): update read-messages missing-scope message to drop im:history

Author: waleedlatif1

apps/sim/app/api/tools/slack/read-messages/route.ts

@@ -105,7 +105,7 @@ export const POST = withRouteHandler(async (request: NextRequest) => {
           {
             success: false,
             error:
-              'Missing required permissions. Please reconnect your Slack account with the necessary scopes (channels:history, groups:history, im:history).',
+              'Missing required permissions. Reconnect your Slack account to grant channel history access (channels:history, groups:history). Reading direct message history is not supported with the Sim bot.',
           },
           { status: 400 }
         )

apps/sim/lib/oauth/oauth.ts

@@ -703,7 +703,6 @@ export const OAUTH_PROVIDERS: Record<string, OAuthProviderConfig> = {
           'chat:write',
           'chat:write.public',
           'im:write',
-          'im:history',
           'im:read',
           'users:read',
           // TODO: Add 'users:read.email' once Slack app review is approved
@@ -712,6 +711,7 @@ export const OAUTH_PROVIDERS: Record<string, OAuthProviderConfig> = {
           'canvases:read',
           'canvases:write',
           'reactions:write',
+          'reactions:read',
         ],
       },
     },