fix(workspace-shell): accept readonly viewCommands in palette builder

Production build (stricter than test/dev) flagged the helper signature
as requiring a mutable array while WorkspaceViewCommandService.commands
returns readonly. The body uses spread, so widening the parameter to
readonly is the correct fix and unblocks `nx build web` plus E2E.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Entire-Checkpoint: c2cea9c530e6

libs/workspace/shell/feature/src/lib/workspace-shell/services/helpers/workspace-shell-command-builders.ts

@@ -38,7 +38,7 @@ export interface CommandBuilderContext {
 
 export function buildCommandPaletteItems(
     ctx: CommandBuilderContext,
-    viewCommands: WorkspaceCommandContribution[]
+    viewCommands: readonly WorkspaceCommandContribution[]
 ): WorkspaceResolvedCommandItem[] {
     return [
         ...getViewCommandDefinitions(ctx),