Release v2.8.0 with native Windows client

[d1same]

Summary

• ship the production native Windows client with secure origin-scoped bridge, D3D11/libmpv playback, hardware-decode reporting, native player parity, and deterministic NSIS packaging
• harden Android in-app update verification and native-to-WebView playback handoffs
• make nested title/related/cast navigation unwind exactly one visited page per Back action
• strengthen Android exact-fixture stress coverage and release contracts
• align root, Android, and Windows versions at 2.8.0

Verification

• npm.cmd run verify:full (439 Node tests + Android lint/unit/build + full emulator stress): passed
• Android emulator exact nested Back sequence: passed
• Android native Live TV -> Multiview surface handoff: passed
• Windows Rust tests with player feature: 19/19 passed
• Windows optimized NSIS package extraction and byte verification: passed
• Windows installer SHA-256: c56872c549190b5f7d576a3e23677ab3c5d6d068875244b0f771efd168a6fc85
• desktop 1280x720 and mobile 390x844 visual checks: no broken visible images, overflow, or console errors