feat: comment submit shortcut preference

[sriramveeraghanta]

Summary

Adds a user profile preference to configure the keyboard shortcut for submitting comments. Users can now choose between Enter (default) and Mod+Enter (⌘+Enter on Mac, Ctrl+Enter on Windows/Linux).

Changes

Backend (apps/api)

• New CommentSubmitShortcut choices and comment_submit_shortcut field on the Profile model
• Migration 0122_profile_comment_submit_shortcut

Shared packages

• @plane/types: new CommentSubmitShortcut type; field added to TUserProfile
• @plane/utils: new isCommentSubmissionValid helper centralizing the keyboard-event matching logic; new getIsMac helper
• @plane/editor: EnterKeyExtension now dynamically handles both shortcut modes — when shortcut is enter, Enter submits and Shift+Enter inserts a newline; when mod_enter, Mod+Enter submits and Enter inserts a newline. submitShortcut is threaded through ILiteTextEditorProps.
• @plane/i18n: new profile-preferences namespace with translations for all 19 supported locales

Web app (apps/web)

• Profile store seeds comment_submit_shortcut: "enter"
• Lite-text editor reads the preference and passes submitShortcut to the editor
• comment-create.tsx and comments/card/edit-form.tsx replace hardcoded Enter-only checks with isCommentSubmissionValid
• New CommentShortcutSelector component in profile preferences (mirrors the ThemeSwitcher pattern); registered in the default preferences list

Space app

• Profile store seeds the new default
• Space lite-text editor reads the preference and passes submitShortcut to the editor

Test plan

• Apply migration 0122_profile_comment_submit_shortcut cleanly on a fresh DB
• Visit Profile → Preferences and confirm the new "Comment submit shortcut" selector renders with the Mac/Windows label variant
• Toggle the preference between Enter and Mod+Enter and confirm it persists across reload
• With shortcut = Enter: Enter submits a comment, Shift+Enter inserts a newline, Mod+Enter inserts a newline
• With shortcut = Mod+Enter: Enter inserts a newline, Shift+Enter inserts a newline, Mod+Enter submits
• Verify behavior on both new-comment and edit-comment flows
• Verify behavior in the Space (public site) comment editor
• Localized labels render correctly across non-English locales

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