Revert LVGL from 9.4.0 to 9.3.0

[KenVanHoeylandt]

LVGL 9.4.0 had intermittend stability issues on T-Deck:
Sometimes the device would simply refuse to boot and show a black screen. It would fail during init and it related to touch or the display.

One way to consistently reproduce it was to enable Wi-Fi, enable development settings, then reboot into USB Mass Storage for SD card.

We'll keep LVGL 9.4.0 for the simullator for now.

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request contains two changes: updates to the ideas documentation file consolidating two ELF loader-related notes into a single item about refactoring the loader to support multiple platforms and executable types, and a downgrade of the lvgl/lvgl dependency version from 9.4.0 to 9.3.0 in the firmware component configuration. No functional code changes are present.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: reverting LVGL from 9.4.0 to 9.3.0 in the idf_component.yml file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch revert-lvgl

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[coderabbitai]

Actionable comments posted: 1