refactor: Extract IssueDetails to shared type (bd-6dnt)

Consolidated 5 duplicate IssueDetails struct definitions into a single
types.IssueDetails in internal/types/types.go:

- Removed 4 inline definitions from cmd/bd/show.go
- Removed 1 inline definition from internal/rpc/server_issues_epics.go

The shared type embeds types.Issue by value and includes:
Labels, Dependencies, Dependents, Comments, and Parent fields.

This improves maintainability and reduces risk of inconsistency.

cmd/bd/show.go

@@ -105,15 +105,7 @@ var showCmd = &cobra.Command{
 				}
 				if jsonOutput {
 					// Get labels and deps for JSON output
-					type IssueDetails struct {
+					details := &types.IssueDetails{Issue: *issue}
-						*types.Issue
-						Labels       []string                             `json:"labels,omitempty"`
-						Dependencies []*types.IssueWithDependencyMetadata `json:"dependencies,omitempty"`
-						Dependents   []*types.IssueWithDependencyMetadata `json:"dependents,omitempty"`
-						Comments     []*types.Comment                     `json:"comments,omitempty"`
-						Parent       *string                              `json:"parent,omitempty"`
-					}
-					details := &IssueDetails{Issue: issue}
 					details.Labels, _ = issueStore.GetLabels(ctx, issue.ID)
 					if sqliteStore, ok := issueStore.(*sqlite.SQLiteStorage); ok {
 						details.Dependencies, _ = sqliteStore.GetDependenciesWithMetadata(ctx, issue.ID)
@@ -155,15 +147,7 @@ var showCmd = &cobra.Command{
 				}
 
 				if jsonOutput {
-					type IssueDetails struct {
+					var details types.IssueDetails
-						types.Issue
-						Labels       []string                             `json:"labels,omitempty"`
-						Dependencies []*types.IssueWithDependencyMetadata `json:"dependencies,omitempty"`
-						Dependents   []*types.IssueWithDependencyMetadata `json:"dependents,omitempty"`
-						Comments     []*types.Comment                     `json:"comments,omitempty"`
-						Parent       *string                              `json:"parent,omitempty"`
-					}
-					var details IssueDetails
 					if err := json.Unmarshal(resp.Data, &details); err == nil {
 						// Compute parent from dependencies
 						for _, dep := range details.Dependencies {
@@ -182,14 +166,7 @@ var showCmd = &cobra.Command{
 					}
 
 					// Parse response first to check shortMode before output
-					type IssueDetails struct {
+					var details types.IssueDetails
-						types.Issue
-						Labels       []string                             `json:"labels,omitempty"`
-						Dependencies []*types.IssueWithDependencyMetadata `json:"dependencies,omitempty"`
-						Dependents   []*types.IssueWithDependencyMetadata `json:"dependents,omitempty"`
-						Comments     []*types.Comment                     `json:"comments,omitempty"`
-					}
-					var details IssueDetails
 					if err := json.Unmarshal(resp.Data, &details); err != nil {
 						fmt.Fprintf(os.Stderr, "Error parsing response: %v\n", err)
 						os.Exit(1)
@@ -380,15 +357,7 @@ var showCmd = &cobra.Command{
 
 			if jsonOutput {
 				// Include labels, dependencies (with metadata), dependents (with metadata), and comments in JSON output
-				type IssueDetails struct {
+				details := &types.IssueDetails{Issue: *issue}
-					*types.Issue
-					Labels       []string                             `json:"labels,omitempty"`
-					Dependencies []*types.IssueWithDependencyMetadata `json:"dependencies,omitempty"`
-					Dependents   []*types.IssueWithDependencyMetadata `json:"dependents,omitempty"`
-					Comments     []*types.Comment                     `json:"comments,omitempty"`
-					Parent       *string                              `json:"parent,omitempty"`
-				}
-				details := &IssueDetails{Issue: issue}
 				details.Labels, _ = issueStore.GetLabels(ctx, issue.ID)
 
 				// Get dependencies with metadata (dependency_type field)

internal/rpc/server_issues_epics.go

@@ -1305,16 +1305,8 @@ func (s *Server) handleShow(req *Request) Response {
 	comments, _ := store.GetIssueComments(ctx, issue.ID)
 
 	// Create detailed response with related data
-	type IssueDetails struct {
+	details := &types.IssueDetails{
-		*types.Issue
+		Issue:        *issue,
-		Labels       []string                              `json:"labels,omitempty"`
-		Dependencies []*types.IssueWithDependencyMetadata `json:"dependencies,omitempty"`
-		Dependents   []*types.IssueWithDependencyMetadata `json:"dependents,omitempty"`
-		Comments     []*types.Comment                      `json:"comments,omitempty"`
-	}
-
-	details := &IssueDetails{
-		Issue:        issue,
 		Labels:       labels,
 		Dependencies: deps,
 		Dependents:   dependents,

internal/types/types.go

@@ -483,6 +483,17 @@ type IssueWithCounts struct {
 	DependentCount  int `json:"dependent_count"`
 }
 
+// IssueDetails extends Issue with labels, dependencies, dependents, and comments.
+// Used for JSON serialization in bd show and RPC responses.
+type IssueDetails struct {
+	Issue
+	Labels       []string                      `json:"labels,omitempty"`
+	Dependencies []*IssueWithDependencyMetadata `json:"dependencies,omitempty"`
+	Dependents   []*IssueWithDependencyMetadata `json:"dependents,omitempty"`
+	Comments     []*Comment                     `json:"comments,omitempty"`
+	Parent       *string                        `json:"parent,omitempty"`
+}
+
 // DependencyType categorizes the relationship
 type DependencyType string