As a user, I want to control whether the keyboard automatically enables Shift when composing a new message, so that I can enter text in my preferred style without needing to manually disable capitalization each time.
Acceptance Criteria
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Add a setting: “Capitalize first letter of new messages”.
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Setting is enabled by default (current behavior).
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When disabled, the keyboard opens with Shift off when starting a new message.
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The setting persists across app launches.
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Existing users retain the default enabled behavior after upgrading.