Docs: rewrite README.md for complete PySide6 transition

README.md

@@ -1,24 +1,29 @@
 <div style="display:flex; gap:16px; align-items:center;">
   <img src="app/assets/logo.png" alt="ICRA" width="140"/>
   <div>
-    <strong>Interactive Color Range Analyzer</strong> is being reimagined with a <em>PySide6</em> user interface.<br/>
-    This branch focuses on building a native desktop shell with modern window controls before porting the color-analysis features.
+    <strong>Interactive Color Range Analyzer (ICRA)</strong><br/>
+    A fully-featured, PySide6-powered desktop application for precise color matching, image analysis, and statistics generation.
   </div>
 </div>
 
-## Current prototype
-- Custom frameless window with minimise / maximise / close controls that hook into Windows natively
-- Dark themed layout and basic image preview powered by Qt
-- “Open image” workflow that displays the selected asset scaled to the viewport
-
-> ⚠️ Legacy Tk features (sliders, exclusions, folder navigation, stats) are not wired up yet. The goal here is to validate the PySide6 shell first.
+## Features
+- **High-Performance Image Processing:** Native, vectorized NumPy operations for lightning-fast HSV conversion and color matching.
+- **Batch Folder Processing:** Load a folder of images and instantly export an aggregated `icra_stats.csv` with localized formatting (dot or comma decimals depending on your language).
+- **Eyedropper Tool:** Quickly pick target matching colors directly from the image canvas.
+- **Advanced Selection:** Support for exclusion zones (rectangles and free-draw polygons) overlaid on the image, all dynamically rendered via `QGraphicsView`.
+- **Modern UI & UX:** 
+  - Drag-and-drop support for files and folders.
+  - Custom dark and light themes with native-feeling borderless titlebars and a categorized menu bar.
+  - Window size and position persistence between launches.
+  - Keyboard shortcuts for rapid workflow.
+- **Configurable:** Uses `config.toml` to drive everything from overlay matching colors to default sliders and application language (`en`/`de`).
 
 ## Requirements
 - Python 3.11+
 - [uv](https://github.com/astral-sh/uv) for dependency management
-- Windows 10/11 recommended (PySide6 build included; Linux/macOS should work but are untested in this branch)
+- Works across Windows, macOS, and Linux (requires PySide6 and numpy)
 
-## Setup with uv (PowerShell example)
+## Setup with uv
 ```bash
 git clone https://git.lukasmahler.de/lm/ICRA.git
 cd ICRA
@@ -28,24 +33,25 @@ uv pip install .
 uv run icra
 ```
 
-The app launches directly as a PySide6 GUI—no browser or local web server involved. Use the “Open Image…” button to load a file and test resizing/snap behaviour.
+## Running the Test Suite
+The core image processing logic and UI data models are rigorously tested using `pytest`.
+```bash
+uv run pytest tests/ -v
+```
 
-## Roadmap (branch scope)
-1. Port hue/saturation/value controls to Qt widgets
-2. Re-implement exclusion drawing using QPainter overlays
-3. Integrate existing image-processing logic (`app/logic`) with the new UI
-
-## Project layout
+## Project Layout
 ```
 app/
   assets/        # Shared branding
-  gui/, logic/   # Legacy Tk code kept for reference
-  qt/            # New PySide6 implementation (main_window, app bootstrap)
-config.toml      # Historical defaults (unused in the prototype)
+  lang/          # Localization strings (TOML format)
+  logic/         # Configuration loading and application constants
+  qt/            # PySide6 implementation (main_window, custom UI widgets, vectorized image processing)
+tests/           # Pytest unit tests
+config.toml      # Configurable overlay colors, slider defaults
 main.py          # Entry point -> PySide6 launcher
 ```
 
-## Development notes
+## Development Notes
+- The legacy `Tkinter` codebase has been completely removed in favor of `PySide6`. 
 - Quick syntax check: `uv run python -m compileall app main.py`
-- Uploaded images are not persisted; the preview uses Qt pixmaps only.
-- Contributions welcome—please target this branch with PySide6-specific improvements.
+- Contributions welcome!