style: Extract UI constants and refactor main view rendering (#30)

- [x] Add golangci-lint configuration with gocritic ifElseChain disabled
- [x] Rename error variables to avoid shadowing (createErr, watcherErr, watchErr, etc.)
- [x] Replace `interface{}` with `any` type alias throughout codebase
- [x] Add package-level documentation comments to all internal packages
- [x] Reorder struct fields alphabetically for consistency
- [x] Extract UI constants (terminal dimensions, column widths, colors) to constants.go
- [x] Refactor BubbleTeaUI main view rendering into smaller helper functions
- [x] Simplify nested conditionals and improve code clarity
- [x] Add `isForwardDisabled()` helper method to BubbleTeaUI
- [x] Update file permissions from 0644 to 0600 in config tests
- [x] Add `#nosec` comments and error suppression where appropriate
- [x] Improve test table struct field ordering for readability
- [x] Fix resource parsing in AddForward using strings.SplitN
- [x] Add comprehensive tests for new UI helper functions and constants

internal/config/config_test.go

@@ -39,7 +39,7 @@ func TestLoadConfig_ValidYAML(t *testing.T) {
             localPort: 8081
 `
 
-	err := os.WriteFile(configPath, []byte(validYAML), 0644)
+	err := os.WriteFile(configPath, []byte(validYAML), 0600)
 	assert.NoError(t, err, "should write temp config file")
 
 	// Load the config
@@ -82,7 +82,7 @@ func TestLoadConfig_InvalidYAML(t *testing.T) {
         forwards: [this is invalid yaml syntax
 `
 
-	err := os.WriteFile(configPath, []byte(invalidYAML), 0644)
+	err := os.WriteFile(configPath, []byte(invalidYAML), 0600)
 	assert.NoError(t, err, "should write temp config file")
 
 	// Load the config
@@ -103,8 +103,8 @@ func TestLoadConfig_FileNotFound(t *testing.T) {
 func TestForward_ID(t *testing.T) {
 	tests := []struct {
 		name       string
-		forward    Forward
 		expectedID string
+		forward    Forward
 	}{
 		{
 			name: "pod with explicit name",
@@ -165,8 +165,8 @@ func TestForward_ID(t *testing.T) {
 func TestForward_String(t *testing.T) {
 	tests := []struct {
 		name           string
-		forward        Forward
 		expectedString string
+		forward        Forward
 	}{
 		{
 			name: "pod without selector",
@@ -389,10 +389,8 @@ func TestHTTPLogSpec_UnmarshalYAML(t *testing.T) {
 			if tt.expected {
 				assert.NotNil(t, fwd.HTTPLog, "HTTPLog should not be nil")
 				assert.True(t, fwd.HTTPLog.Enabled, "HTTPLog.Enabled should be true")
-			} else {
-				if fwd.HTTPLog != nil {
-					assert.False(t, fwd.HTTPLog.Enabled, "HTTPLog.Enabled should be false")
-				}
+			} else if fwd.HTTPLog != nil {
+				assert.False(t, fwd.HTTPLog.Enabled, "HTTPLog.Enabled should be false")
 			}
 		})
 	}
@@ -407,8 +405,8 @@ func TestNewEmptyConfig(t *testing.T) {
 
 func TestConfig_IsEmpty(t *testing.T) {
 	tests := []struct {
-		name     string
 		config   *Config
+		name     string
 		expected bool
 	}{
 		{
@@ -505,7 +503,7 @@ func TestCreateEmptyConfigFile_AlreadyExists(t *testing.T) {
 	configPath := filepath.Join(tmpDir, ".kportal.yaml")
 
 	// Create existing file
-	err := os.WriteFile(configPath, []byte("existing content"), 0644)
+	err := os.WriteFile(configPath, []byte("existing content"), 0600)
 	assert.NoError(t, err)
 
 	// Try to create config file - should fail