feat: improve version detection and error handling

- Add fallback to mo --version when brew list fails
- Add error handling for debug log write failures
- Improve version extraction with multiple fallback strategies

Author: tw93

lib/core/common.sh

@@ -79,6 +79,7 @@ update_via_homebrew() {
     if echo "$upgrade_output" | grep -q "already installed"; then
         local installed_version
         installed_version=$(brew list --versions mole 2> /dev/null | awk '{print $2}')
+        [[ -z "$installed_version" ]] && installed_version=$(mo --version 2> /dev/null | awk '/Mole version/ {print $3; exit}')
         echo ""
         echo -e "${GREEN}${ICON_SUCCESS}${NC} Already on latest version (${installed_version:-$current_version})"
         echo ""
@@ -90,6 +91,7 @@ update_via_homebrew() {
         echo "$upgrade_output" | grep -Ev "^(==>|Updating Homebrew|Warning:)" || true
         local new_version
         new_version=$(brew list --versions mole 2> /dev/null | awk '{print $2}')
+        [[ -z "$new_version" ]] && new_version=$(mo --version 2> /dev/null | awk '/Mole version/ {print $3; exit}')
         echo ""
         echo -e "${GREEN}${ICON_SUCCESS}${NC} Updated to latest version (${new_version:-$current_version})"
         echo ""

lib/core/log.sh

@@ -180,7 +180,9 @@ log_system_info() {
 
     # Reset debug log file for this new session
     ensure_user_file "$DEBUG_LOG_FILE"
-    : > "$DEBUG_LOG_FILE"
+    if ! : > "$DEBUG_LOG_FILE" 2> /dev/null; then
+        echo -e "${YELLOW}${ICON_WARNING}${NC} Debug log not writable: $DEBUG_LOG_FILE" >&2
+    fi
 
     # Start block in debug log file
     {

mole

@@ -346,7 +346,13 @@ update_mole() {
 
         if ! printf '%s\n' "$output" | grep -Eq "Updated to latest version|Already on latest version"; then
             local new_version
-            new_version=$("$mole_path" --version 2> /dev/null | awk 'NR==1 && NF {print $NF}' || echo "")
+            new_version=$(printf '%s\n' "$output" | sed -n 's/.*(\([^)]*\)).*/\1/p' | head -1)
+            if [[ -z "$new_version" ]]; then
+                new_version=$("$mole_path" --version 2> /dev/null | awk 'NR==1 && NF {print $NF}' || echo "")
+            fi
+            if [[ -z "$new_version" ]]; then
+                new_version="$latest"
+            fi
             printf '\n%s\n\n' "${GREEN}${ICON_SUCCESS}${NC} Updated to latest version (${new_version:-unknown})"
         else
             printf '\n'