🔒 Fix Plain Text Password Storage for Long Passwords

[G30RG3-GJ]

This PR addresses a security vulnerability where passwords of length 16 or greater were stored in plain text in the Preferences configuration file.

The fix involves modifying Preferences.setPassword to always hash the password using DigestUtils.shaHex, consistent with the existing behavior for shorter passwords.

Changes:

• Modified src/library/assistant/ui/settings/Preferences.java: Removed conditional logic that skipped hashing for long passwords.
• Added test/library/assistant/ui/settings/PreferencesTest.java: New unit test to verify that both short and long passwords are correctly hashed.
• Added test/stubs/library/assistant/alert/AlertMaker.java: Stub for AlertMaker to allow compiling Preferences (which has UI dependencies) in the headless test environment.

Verification:

• Ran PreferencesTest (via custom script) to confirm the fix.
• Ran existing run_tests.sh to ensure no regressions in other parts of the system.

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PR created automatically by Jules for task 126410527248508142 started by @G30RG3-GJ

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