Add global search

[Jim8y]

Scope

• Add a focused Global Search page reachable from the Home toolbar.
• Search across wallet assets, saved contacts, and regular dApps without changing the Home dashboard layout.
• Prioritize matching recently used dApps from dapps/recent before other result groups and mark them with a localized recently-used badge.
• Use real token and dApp icons in search results, keeping the contact glyph fallback.
• Reuse the existing asset detail, contact edit, and dApp launch flows for result actions.
• Apply the existing iOS minimal SearchBar style on the new page to avoid the dark native search background block.

Review follow-up

• Addressed Copilot feedback by loading data sequentially on the shared DbContext, showing the empty state only after a non-empty query, and using cached searchable indexes with a 200ms debounce.
• Addressed Erik feedback by showing real token/dApp icons in search results.

Validation

• git diff --check
• Resource parity check across all Strings*.resx files: 285 keys.
• iOS simulator, iPhone 17 Pro iOS 26.5: built, installed, opened Global Search, searched vault, verified OneGate Vault appears before Vaulten with the 最近使用 badge.
• Android emulator: built, installed, opened Global Search, searched vault, verified OneGate Vault appears before Vaulten with the Recently used badge, and checked the crash buffer was empty.

Screenshots

• iOS: https://github.com/Jim8y/OneGateApp/releases/download/pr-54-screenshots-20260621/onegate-pr54-ios-global-search-latest.png
• Android: https://github.com/Jim8y/OneGateApp/releases/download/pr-54-screenshots-20260621/onegate-pr54-android-global-search-latest.png

Known limitations

• Results are intentionally capped per category to keep this PR small and focused.
• This PR adds the global entry and result flow only; it does not redesign the Home dashboard or dApp detail pages.

[Jim8y]

Updated durable iOS and Android simulator verification screenshots:

• iOS: https://github.com/Jim8y/OneGateApp/releases/download/pr-54-screenshots-20260621/onegate-pr54-ios-global-search-latest.png
• Android: https://github.com/Jim8y/OneGateApp/releases/download/pr-54-screenshots-20260621/onegate-pr54-android-global-search-latest.png

Both screenshots verify OneGate Vault is prioritized ahead of Vaulten for vault because it is recently used, and that the localized recently-used badge is shown. They also show dApp icon rendering rather than the generic glyph.

[Copilot]

Pull request overview

Adds a new Global Search experience to the MAUI app, reachable from the Home toolbar, enabling search across wallet assets, saved contacts, and regular dApps while reusing existing navigation flows.

Changes:

• Add GlobalSearchPage (XAML + code-behind) that loads assets/contacts/dApps and filters results.
• Add a Home toolbar entry that navigates to the new search route.
• Add localized string resources (EN + zh-Hans) and register the Shell route.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
OneGateApp/Properties/Strings.zh-Hans.resx	Adds zh-Hans localization for the Global Search page title.
OneGateApp/Properties/Strings.resx	Adds default (neutral) localization for the Global Search page title.
OneGateApp/Properties/Strings.Designer.cs	Exposes the new Strings.GlobalSearch resource accessor.
OneGateApp/Pages/HomePage.xaml	Adds a primary toolbar item that navigates to Global Search.
OneGateApp/Pages/GlobalSearchPage.xaml.cs	Implements loading + filtering + navigation for global search results.
OneGateApp/Pages/GlobalSearchPage.xaml	Defines the Global Search UI and binds to results/loading state.
OneGateApp/AppShell.xaml.cs	Registers the home/search Shell route for navigation.

Files not reviewed (1)

• OneGateApp/Properties/Strings.Designer.cs: Generated file

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[erikzhang]

Use real icons for tokens and dapps?

[Jim8y]

@erikzhang fixed in 1584698: token results now use asset.Token.Icon with the token default fallback, and dApp results use DApp.IconUrl; contacts keep the existing glyph fallback. The updated screenshots above also show the real dApp icons, plus the recently-used dApp ordering and badge.