feat: add sale invoice card component with functionality for sending and retrieving invoice status

- Implemented sale invoice card component with HTML and TypeScript files.
- Added API routes for sale invoices including sending, retrying, and checking status.
- Created models for sale invoice fiscal actions and filters.
- Developed service for handling sale invoice operations.
- Introduced store for managing sale invoice state.
- Created views for listing and displaying single sale invoices.
- Added support for managing stock keeping units with forms and services.
- Implemented reusable select components for measure units and SKUs.
- Enhanced shared components for input fields including fiscal ID, SKU type, and VAT.

ai_agent.md

@@ -0,0 +1,34 @@
+# AI Agent Assistant Guide
+
+This file provides a quick operational guide for AI assistants working on this project.
+
+## Project
+- Framework: Angular
+- Package manager: pnpm
+- Root path: `/Users/ahasani/Projects/PSP/consumer/panel`
+
+## Core Rules
+- Follow `AGENTS.md` instructions in this repository.
+- Avoid reverting unrelated local changes.
+- Keep edits minimal and scoped to the requested feature.
+- Prefer existing shared abstractions and services over duplicating logic.
+
+## Common Commands
+```bash
+pnpm install
+pnpm start
+pnpm build
+pnpm test
+```
+
+## Useful Practices
+- Search files quickly with `rg` when available.
+- For form changes, keep model/interface, form controls, and templates aligned.
+- For Android WebView integration, keep contract changes synchronized between panel and Android app.
+- For shared components, preserve desktop behavior and add mobile behavior conditionally.
+
+## Delivery Checklist
+- Build passes (or document why not run).
+- No unrelated files changed.
+- New behavior documented in changed file comments only when necessary.
+- Keep final output short with file paths and key behavior changes.