Add transient provider detail carrier

[Finesssee]

Summary

• Add a transient ProviderDisplayDetail carrier for credit balances, subscription metadata, and other provider values that are not quota windows or inventory.
• Keep core fetch serialization, quota math, pace, notifications, and account actions isolated from these rows; validate compact display-safe values and duplicate IDs.
• Project the rows through the Tauri bridge, provider detail pane, menu card, settings usage section, and CLI text/JSON output.

Validation

• cargo test --manifest-path rust/Cargo.toml --lib core::usage_snapshot::tests
• cargo test --manifest-path rust/Cargo.toml --lib cli::usage::tests::display_details_are_rendered_in_full_text_and_json
• cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml commands::tests::provider_inventory_maps_to_the_bridge_without_token_ids
• cargo clippy --manifest-path rust/Cargo.toml --all-targets -- -D warnings
• cargo clippy --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml --all-targets -- -D warnings
• git diff --check

Frontend Vitest was not run because the worktree intentionally has no node_modules; no dependency install was performed.

Dependency

This branch is based on codex/port-0.61.0-inventory (PR #560) so the provider ports can add display details on top of the shared transient carrier.

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