post to bluesky when manifests uploaded. linting fixes

cmd/credential-helper/main.go

@@ -127,7 +127,9 @@ func handleGet() {
 			fmt.Fprintf(os.Stderr, "Stored credentials for %s are invalid or expired\n", appViewURL)
 			// Delete the invalid credentials
 			delete(allCreds.Credentials, appViewURL)
-			saveDeviceCredentials(configPath, allCreds)
+			if err := saveDeviceCredentials(configPath, allCreds); err != nil {
+				fmt.Fprintf(os.Stderr, "Warning: failed to save updated credentials: %v\n", err)
+			}
 			// Mark as not found so we re-authorize below
 			found = false
 		}

cmd/oauth-helper/main.go

@@ -2,8 +2,6 @@ package main
 
 import (
 	"context"
-	"crypto/sha256"
-	"encoding/base64"
 	"flag"
 	"fmt"
 	"log"
@@ -135,9 +133,3 @@ func generateDPoPProof(session *indigo_oauth.ClientSession, method, reqURL strin
 	// Use the session's NewHostDPoP method to generate the proof
 	return session.NewHostDPoP(method, reqURL)
 }
-
-// sha256Hash computes SHA-256 hash and returns base64url-encoded string
-func sha256Hash(data []byte) string {
-	hash := sha256.Sum256(data)
-	return base64.RawURLEncoding.EncodeToString(hash[:])
-}