refactor(ui): remove abandoned Material-Design component library + screens layer

~9,988 lines of header-only UI code that no compiled translation unit reached,
verified by transitive include-reachability from every .cpp plus a symbol sweep
(all 28 component classes — Snackbar, Ripple, NavDrawerSpec, TabBarSpec,
TransitionManager, … — had zero references in live code):

- src/ui/material/ component library: the material.h umbrella, components/*
  (app_bar, cards, chips, dialogs, inputs, lists, nav_drawer, progress, slider,
  snackbar, tabs, text_fields), and the animation system (elevation, motion,
  ripple, transitions, app_layout) — 19 headers. Kept the live helpers the app
  actually uses directly: color_theme, colors, type/typography, draw_helpers,
  layout, project_icons, and components/buttons (included by mining_tab).
- src/ui/screens/ layer: main_layout, home_screen, send_screen, etc. — the
  original screen stack and the only consumer of the dead component library.
  The live UI runs through ui/windows/ (34 .cpp) + ui/pages/.
- src/embedded/resources.h: a superseded dragonx::embedded::Resources duplicate;
  the app uses src/resources/embedded_resources.h.

None were in CMakeLists or included by live code, so the build is unaffected.
Both variants build; full test suite passes; source-hygiene check clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CLAUDE.md

@@ -49,7 +49,7 @@ There is no per-test filtering — it is one binary that runs every assertion. T
 
 **Data model** (`src/data/`): `WalletState`, `address_book`, `transaction_history_cache`, `exchange_info`. UI reads from these.
 
-**UI** (`src/ui/`): `windows/` are the tabs and dialogs (one pair per screen, e.g. `send_tab`, `mining_tab`, `console_tab`), `pages/` are multi-section screens (Settings), `screens/` are layout headers, `material/` is the design-system layer, `schema/` loads the TOML UI schema/skins, `effects/` is GL post-processing (blur/acrylic).
+**UI** (`src/ui/`): `windows/` are the tabs and dialogs (one pair per screen, e.g. `send_tab`, `mining_tab`, `console_tab`), `pages/` are multi-section screens (Settings), `material/` is the design-system layer (the live helpers `color_theme`, `colors`, `type`/`typography`, `draw_helpers`, `layout`, `project_icons`, `components/buttons`), `schema/` loads the TOML UI schema/skins, `effects/` is GL post-processing (blur/acrylic).
 
 **Lite wallet** (`src/wallet/`): the bridge to an external `litelib_*` C-ABI backend. `lite_client_bridge` loads the backend (via direct `litelib_*` externs in `linkedSdxl()`) and owns each Rust string through `lite_owned_string` (copy-before-free / free-once). On top sit `lite_connection_service`, `lite_sync_service`, `lite_result_parsers`, `lite_wallet_gateway`, `lite_wallet_state_mapper`, and `lite_wallet_lifecycle_service`, all driven by `lite_wallet_controller`. The real frontend entry points are `lite_wallet_lifecycle_ui_adapter` and `lite_wallet_server_selection_adapter` (used by `src/ui/pages/settings_page.cpp`); everything else is reachable through them. (The prebuilt-backend symbol check for `DRAGONX_ENABLE_LITE_BACKEND` is done in CMake against the symbols inventory — see below — not in C++.)