fix(tui): gate rate-limit tier switch on the Anthropic provider

[BunsDev]

Summary

• Gates the rate-limit recovery modal's one-key Sonnet/Haiku tier switch on the active provider being Anthropic.

Context

• Related issue/user request: code-review finding on the rate-limit recovery flow landed in f2046ee — the modal opens for any provider's structured 429 (From<ProviderError> for ClaudeError maps every provider's RateLimited into it), but the s/h actions unconditionally call set_model(SONNET/HAIKU) and persist_provider_and_model(), flipping a Codex-only session to Anthropic persistently, with no credentials to back it.
• Scope: crates/tui (rate_limit_recovery.rs, app.rs) plus the matching sentence in docs/advanced.md.
• Non-goals: any other recovery-flow behavior; non-TUI 429 handling.

Changes

• Add tier_switch_available to RateLimitRecoveryState, set from the active provider when the modal opens (same probe the duplicate-profile scan already uses).
• Gate the [s]/[h] action hints and key-handler arms on it.
• New test tier_actions_hidden_for_non_anthropic_provider; existing tests updated for the new open() parameter.
• Document the gating in docs/advanced.md.

Validation

Record exact commands and outcomes. Mark items N/A with a reason when they do not apply.

• git diff --check — clean.
• cargo fmt --all — clean.
• cargo check --package claurst-tui — passed (change is TUI-scoped; workspace check ran on the same tree state earlier tonight).
• cargo clippy --package claurst-tui --all-targets -- -D warnings — passed.
• Targeted/manual checks: cargo test --package claurst-tui rate_limit — 15 passed, 0 failed.
• Not run: full cargo test --workspace — change is confined to claurst-tui; the touched module's suite plus package clippy/check cover it.

PR Readiness

• Diff is limited to the intended files.
• Generated files were not edited by hand.
• User-facing docs/help were updated or are not needed.
• No secrets, credentials, local paths, or unrelated logs are included.
• Remaining risks or follow-up work are listed above.

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview	Jul 7, 2026 7:00am

[Copilot]

Pull request overview

This PR prevents the TUI rate-limit recovery modal from offering (or handling) the one-key Sonnet/Haiku tier-switch actions when the active provider is not Anthropic, avoiding persisting an invalid provider/model configuration (e.g., flipping a Codex session into Anthropic without credentials).

Changes:

• Add tier_switch_available to RateLimitRecoveryState, set when opening the modal based on whether the active provider is Anthropic.
• Gate the [s] / [h] action hints and the corresponding key-handler branches on tier_switch_available.
• Update/add tests and document the provider gating in docs/advanced.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src-rust/crates/tui/src/rate_limit_recovery.rs	Adds tier_switch_available, gates action hint rendering, updates tests and adds a non-Anthropic coverage test.
src-rust/crates/tui/src/app.rs	Computes is_anthropic when opening the modal and gates s/h key handling accordingly.
docs/advanced.md	Documents that s/h tier switching is only offered for the Anthropic provider.

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