Fixed 86Box stack issues

doc/assets/screenshot.md

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+
+![Screenshot of the boot + text test](/doc/assets/Capture-2026-01-29-210122.png)
+
+Screenshot of early boot version + Text functions
+
+![Screenshot WIP - Buttons & Sliders](/doc/assets/Capture-2026-02-03-213148.png)
+
+Screenshot of early buttons & sliders
+
+![Screenshot WIP - Rounded Buttons & Checkboxes ](/doc/assets/Capture-2026-02-06-232336.png)
+
+Screenshot of rounded buttons & checkboxes

doc/build.md

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+### Build & Run
+
+#### Compilation
+
+From the project root:
+
+```bash
+cd src
+nasm -f bin boot.asm -o ..\build\bios.bin
+```
+
+This produces a raw BIOS ROM image (bios.bin) suitable for direct execution by QEMU.
+
+#### QEMU Execution
+
+The QEMU VGA BIOS must be copied into a local rom/ directory.
+
+Default locations of `vgabios.bin`:
+
+Windows
+`C:\Program Files\qemu\share\vgabios.bin`
+
+Linux
+`/usr/share/qemu/vgabios.bin`
+
+You can use an video bios from the 86box's project:
+
+https://github.com/86Box/roms
+
+Copy it to: `roms/vgabios.bin`
+
+Then run QEMU with:
+
+```bash
+qemu-system-i386 \
+  -bios build/bios.bin \
+  -device loader,file=roms/vgabios.bin,addr=0xC0000,force-raw=on \
+  -device isa-debugcon,chardev=myconsole \
+  -chardev stdio,id=myconsole \
+  -k be \
+  -display sdl
+```
+
+This command:
+
+- Loads the custom BIOS as the system ROM
+- Injects the VGA BIOS at 0xC0000
+- Redirects debug output to the console
+- Displays graphics using SDL
+
+#### 86Box Execution
+
+This is a bit tricky since 86box doesn't allow to pick custom BIOS file. You'll have to choose an existing computer and replace the original BIOS file with the compliled one.
+
+create a new configuration:
+![86Box Config - Machine](/doc/assets/86box-machine.png)
+
+![86Box Config - video](/doc/assets/86box-video.png)
+
+- save the configuration
+- go to the 86Box's `roms\machines\vli486sv2g\` folder
+- rename the `0402.001` file (it's the original machine's BIOS);
+- copy the `build\bios.bin` into the 86Bos's `roms\machines\vli486sv2g\` folder and rename as `0402.001`
+
+