Fix native File Provider approval onboarding

[aseembits93]

Summary

• Treat the macOS native "Start Syncing" OK action as File Provider approval during onboarding, so users do not need a separate Enable click after accepting the native prompt.
• Handle remembered macOS denial state by preparing the File Provider domain for retry, then directing explicit retries to System Settings / File Providers when macOS still reports Locality disabled.
• Add desktop UI/backend coverage for the native prompt, denial retry, and System Settings fallback flows.
• Add make install-macos-prompt-test-app plus a dry-run-tested installer for a fresh prompt-test app install/reset/register/launch flow.

Test Plan

• cargo test -p locality-desktop workspace_mount_onboarding -- --nocapture
• cargo test -p loc-cli macos_file_provider_unavailable_error_is_actionable -- --nocapture
• npm --prefix apps/desktop test -- onboarding-mount.test.ts --run
• npm --prefix apps/desktop run build
• bash -n scripts/install-macos-prompt-test-app.sh scripts/install-macos-prompt-test-app.test.sh && make test-macos-prompt-test-app-installer
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
locality	Ready	Preview, Comment	Jul 14, 2026 8:21pm