fix: instant note editor to restore text when orientation changes

[criticalAY]

Purpose / Description

The instant note editor re-init the view model cloze text to the raw text in case of orientation change and we want to avoid it and populate the fields/chips with the original text, hence save and restore the cloze text in case its changed

Approach

Use savedInstanceState

How Has This Been Tested?

Before:
Screen_recording_20250208_021505.webm

After:
Screen_recording_20250208_021425.webm

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[david-allison]

I believe this introduces a bug if the activity is destroyed when being backgrounded. Could you check with Don't keep Activities

[david-allison]

LGTM, one minor requested refactor