feat: add texture diagnostics to viewer

lib/client-types.ts

@@ -5,6 +5,20 @@ export interface TextureFile {
   file: File
 }
 
+export type TextureDiagnosticSeverity = 'error' | 'warning'
+
+export interface TextureDiagnosticIssue {
+  severity: TextureDiagnosticSeverity
+  title: string
+  detail: string
+}
+
+export interface TextureDiagnosticReport {
+  status: 'idle' | 'ok' | 'warning' | 'error'
+  summary: string
+  issues: TextureDiagnosticIssue[]
+}
+
 export type DriveStatus = 'pending' | 'uploading' | 'success' | 'error' | 'skipped'
 
 export interface FolderEntry {
@@ -20,6 +34,7 @@ export interface FolderEntry {
   assetUrls: Record<string, string>
   viewerOpen?: boolean
   warnings: string[]
+  textureReport: TextureDiagnosticReport
   driveStatus?: DriveStatus
   driveError?: string
 }