feat(ui): animated boot splash and loading screen
Show a Lottie-animated splash while the app bundle boots and dismiss it once WebAppComponent initialises, plus a reusable mifosx-loading-screen component with loading and error animations. lottie.min.js is served from the lottie-web package instead of being vendored into src/assets. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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