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/k8s/resolver.go

@@ -19,15 +19,15 @@ const (
 
 // ResolvedResource represents a resolved Kubernetes resource.
 type ResolvedResource struct {
-	Name      string    // The resolved pod or service name
-	Namespace string    // The namespace
-	Timestamp time.Time // When this was resolved
+	Timestamp time.Time
+	Name      string
+	Namespace string
 }
 
 // cacheEntry stores a cached resolution result with expiry.
 type cacheEntry struct {
-	resource  ResolvedResource
 	expiresAt time.Time
+	resource  ResolvedResource
 }
 
 // ResourceResolver resolves Kubernetes resources with caching.
@@ -188,7 +188,7 @@ func (r *ResourceResolver) getFromCache(key string) string {
 		// Upgrade to write lock and delete expired entry
 		r.cacheMu.Lock()
 		// Double-check entry still exists and is still expired (may have been updated)
-		if entry, exists := r.cache[key]; exists && time.Now().After(entry.expiresAt) {
+		if expiredEntry, ok := r.cache[key]; ok && time.Now().After(expiredEntry.expiresAt) {
 			delete(r.cache, key)
 		}
 		r.cacheMu.Unlock()