Add data-driven pause menu settings view
Introduce a new SETTINGS view to the pause menu with two tabs: GAME SETTINGS (placeholder to open vanilla Fallout 4 settings) and MULTIPLAYER SETTINGS (data-driven custom options). Adds HTML for the settings panel and tabs, comprehensive CSS for tab/pane/row styling, and a large JS update that provides: F4SE/C++ bridge stubs (openGameSettings, setMultiplayerSetting, onBack, onOpenView), a multiplayerSettings data model, rendering and keyboard navigation (tab/content focus, row movement, value cycling), prompt-bar updates, and view-mode transitions (pause/map/settings). Also: map interaction refinements, map blur handling, open settings by default, and documentation updates in changelog.md and docs/dev-log.md.
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