sync: smoother shared preference manager clearing (fixes #13008)

[dogi]

This PR moves the SharedPreferences clearing logic from SyncActivity's companion object into SharedPrefManager. This eliminates the need for manual dependency injection via EntryPointAccessors when clearing data and properly encapsulates preference lifecycle management.

Changes:

• Added clearPreferences() to SharedPrefManager and injected ApplicationContext as a class property for accessing PreferenceManager.
• Replaced the call in SettingsActivity and SyncActivity with the injected SharedPrefManager instance.
• Removed unused imports and cleaned up the companion object.

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PR created automatically by Jules for task 16783400589895170730 started by @dogi

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[Okuro3499]

SharedPrefManager.kt:13 — change val context: Context back to private val context: Context. There's no reason to expose it publicly.

new code

[dogi]

@copilot resolve the merge conflicts in this pull request

[Copilot]

SharedPrefManager.kt:13 — change val context: Context back to private val context: Context. There's no reason to expose it publicly.

Updated in commit 5d3062d: SharedPrefManager now uses @ApplicationContext private val context: Context.

@copilot resolve the merge conflicts in this pull request

Resolved by merging origin/master into this branch and fixing the SyncActivity conflict while keeping the SharedPrefManager-based clear logic refactor. Included in commit 3658a84.

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