fix: improve input method warnings and simplify releases

[ygsgdbd]

Summary

TypeSwitch could retain a stale input-method failure warning after the user manually corrected the selection. The release workflow had also accumulated rebuild, remote-verification, and cross-channel coordination logic while still allowing a lower valid tag to replace the latest GitHub, Sparkle, and Homebrew version.

This change:

• clears the active failed-switch diagnostic when a matching manual selection succeeds, without changing switch statistics;
• adds a localized VoiceOver warning for input-method failures;
• simplifies publishing to publish and homebrew jobs, with GitHub Release as the immutable source of truth;
• validates strict annotated tags on main, rejects version rollback, verifies local artifacts and Sparkle signatures, and attests the release ZIP;
• makes Homebrew synchronization consume the published ZIP and independently reject cask downgrades;
• records the remaining P2/P3 review follow-ups in Documentation/CodeReview-2026-08-17.md.

Testing

• Full macOS XCTest suite: 128 tests, 0 failures.
• Release-script scenarios cover strict tag ordering, checksum and bundle metadata failures, universal architecture, appcast metadata, EdDSA verification, Homebrew upgrades, idempotency, and downgrade rejection.
• Verified the repository's current v0.9.0 tag is accepted as the highest strict version on origin/main.

Changelog

Select exactly one:

• Updated both Chinese and English entries under Unreleased in CHANGELOG.md.
• No changelog entry is needed. Reason: N/A

Privacy

• This change does not add telemetry or upload user data, or the reason this is not applicable is explained above.

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