refactor: add OAuth timeout and remove unused color variables

- Add --max-time 30 to OAuth key exchange curl to prevent indefinite hangs
- Remove unused DIM variable from cli/install.sh
- Remove unused BLUE variable from cli/spawn.sh

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

cli/install.sh

@@ -19,7 +19,6 @@ RED='\033[0;31m'
 GREEN='\033[0;32m'
 YELLOW='\033[1;33m'
 BOLD='\033[1m'
-DIM='\033[2m'
 NC='\033[0m'
 
 log_info()  { echo -e "${GREEN}[spawn]${NC} $1"; }

cli/spawn.sh

@@ -32,7 +32,6 @@ SPAWN_CACHE_TTL=3600  # 1 hour in seconds
 RED='\033[0;31m'
 GREEN='\033[0;32m'
 YELLOW='\033[1;33m'
-BLUE='\033[0;34m'
 BOLD='\033[1m'
 DIM='\033[2m'
 NC='\033[0m'

shared/common.sh

@@ -418,7 +418,7 @@ exchange_oauth_code() {
     local oauth_code="${1}"
 
     local key_response
-    key_response=$(curl -s -X POST "https://openrouter.ai/api/v1/auth/keys" \
+    key_response=$(curl -s --max-time 30 -X POST "https://openrouter.ai/api/v1/auth/keys" \
         -H "Content-Type: application/json" \
         -d "{\"code\": \"${oauth_code}\"}")