refactor(host): migrate host providers + chain client to @parity/product-sdk-host (phase 4)

[Imod7]

What

Migrates packages/shared + packages/admin to the @parity/product-sdk-host facade (^0.6.0 → ^0.9.0).

This is a semantic rewrite, not a path swap: the facade getters are async + nullable and throw, versus the old sync objects + neverthrow .match().

Changes

leaf utilities

• cache/storage.ts: hostLocalStorage → getHostLocalStorage() (async, null-guarded)
• host/navigation.ts: hostApi.navigateTo → getTruApi().navigateTo (Result kept)
• host/permissions.ts: facade requestPermission/requestDevicePermission
  (boolean + throw → .catch(() => false)); featureSupported via getTruApi()
• host/theme.ts: createThemeProvider() → getThemeProvider() (async, fire-and-forget)
• admin/pages/debug.vue: dynamic hostApi import → getTruApi() (guarded)

host core

• host/notifications.ts: notificationManager → getNotificationManager() (async, nullable)
• host/wallet.ts: createAccountsProvider → getAccountsProvider(); drop injectSpektrExtension; requestResourceAllocation now takes the resource array directly and returns AllocationOutcome[] (no v1 envelope / no neverthrow); host signRaw → product-account signer signBytes
• host/client.ts: createPapiProvider (sync) → getHostProvider() (async, nullable); useMainClient/useBulletinClient become async, awaited across contracts read/write/multicall, bulletin, event-watcher, allowances, debug

Dependencies

Only change: @parity/product-sdk-host ^0.6.0 → ^0.9.0 (shared + admin).

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​parity/​product-sdk-host@​0.6.0 ⏵ 0.10.0	+1		+1	+2

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