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/benchmark/runner_test.go

@@ -106,7 +106,7 @@ func TestRunner(t *testing.T) {
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		time.Sleep(5 * time.Millisecond) // Simulate some latency
 		w.WriteHeader(http.StatusOK)
-		w.Write([]byte(`{"status":"ok"}`))
+		_, _ = w.Write([]byte(`{"status":"ok"}`))
 	}))
 	defer server.Close()
 
@@ -132,7 +132,7 @@ func TestRunner(t *testing.T) {
 func TestRunnerWithDuration(t *testing.T) {
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)
-		w.Write([]byte(`ok`))
+		_, _ = w.Write([]byte(`ok`))
 	}))
 	defer server.Close()
 
@@ -210,7 +210,7 @@ func TestRunnerWithProgressCallback(t *testing.T) {
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		time.Sleep(10 * time.Millisecond) // Add small delay so progress ticker can fire
 		w.WriteHeader(http.StatusOK)
-		w.Write([]byte(`ok`))
+		_, _ = w.Write([]byte(`ok`))
 	}))
 	defer server.Close()