refactor: Update tutorial imports for frozen steami_screen.

[nedseb]

Description

After steami_screen is frozen in the firmware, the 15 tutorials need their imports updated. The main.py files should import directly (no sys.path hacks). The screenshot.py files need to reference steami_screen from micropython-steami-lib or micropython-steami-tools.

Tasks

• Update all 15 tutorials/*/main.py — remove any sys.path manipulation, use direct imports
• Update all 15 tutorials/*/screenshot.py — adapt import paths for tools repo structure
• Verify all main.py work on board with frozen firmware
• Verify all screenshot.py work with python validate.py from tools repo

Files to update (15 tutorials)

01_temperature, 02_battery, 03_comfort_dual, 04_circular_gauge, 05_scrolling_graph, 06_dpad_menu, 07_compass, 08_smiley_happy/sad/surprised/angry/sleeping/love/reactive, 09_watch

Blocked by

• feat: Freeze steami_screen and display wrappers in firmware. micropython-steami-lib#271 — Freeze in firmware
• feat: Scaffold repo and migrate simulation/validation tools. micropython-steami-tools#1 — Tools repo ready

Parent

• refactor: Remove library and tools after migration to dedicated repos. #1 — Cleanup umbrella issue