feat(app): add preferences to main menu #10760

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🎬 Cutter preview — PR #10760

Open Preferences submenu
Open Preferences submenu — Main menu now includes a Preferences submenu with toggles for tool lock, snap, grid, zen mode, view mode, and stats.		Toggle 'Tool lock' preference via menu
Toggle 'Tool lock' preference via menu — Main menu gains a Preferences submenu grouping Tool lock, Snap, Grid, Zen, View, and Stats toggles.
Toggle Tool lock via Q shortcut
Toggle Tool lock via Q shortcut — Main menu now includes a Preferences submenu for tool lock, snap, grid, zen, view mode, and stats.