fix(frontend): refine bird icon assets

[Alexander-Noah]

变更说明

• 将启动页资源切换为小鸟图标，并修复边缘白边/突兀感
• 通过 expo-splash-screen 重新生成 Android 启动页资源
• 同步更新前端依赖配置

影响范围

• 仅涉及启动图标 / 启动页资源调整
• 不包含业务逻辑、后端或数据库变更

与 Issue 的关系

• 关联 #403
• 与 PR #407 一起完成 Android 品牌图标资源统一的最终收口

[LUPENGHAN]

ok

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
backend	96.57% <ø> (-0.08%)	⬇️
frontend	90.71% <ø> (+1.00%)	⬆️

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see 58 files with indirect coverage changes

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[fennoai]

The Expo splash configuration and new launcher assets parse successfully, and an isolated Android prebuild completes. However, the PR’s Closes #403 contract is not satisfied: the linked issue requires a dedicated notification icon wired into both expo-notifications and expo-location, plus the native alarm resolver, while this diff only changes launcher/splash assets and leaves the notification configuration and native module unchanged. Please either implement that notification-icon scope in this PR or remove the closing reference before merging.

Verification: npm ci --ignore-scripts, npx expo config --json, isolated npx expo prebuild --platform android --no-install --clean, ESLint, Prettier, and git diff --check passed; expo-doctor still reports pre-existing dependency/version issues.