fix: apply cargo clippy fixes

[devin-ai-integration]

Summary

Ran cargo clippy --fix and manually applied remaining clippy suggestions across the workspace. After merging main, most initial fixes were already upstream; this PR contains the remaining items.

Changes:

• Cargo.toml: Excluded plugins/apple-contact and plugins/pdf from workspace (directories exist but have no Cargo.toml)
• cactus/batch.rs: Flattened nested if let / if into let-chains syntax, with dprint-compliant formatting
• soniox/live.rs: Removed unnecessary explicit lifetime annotations in partition_tokens_by_word_finality where elision applies

Review & Testing Checklist for Human

• Verify the let-chains rewrite in crates/owhisper-client/src/adapter/cactus/batch.rs preserves the original control flow — the inner if channel.alternatives... block must still only execute when the outer pattern match succeeds. The old code was if let { if cond { body } } and the new code is if let && cond { body } — these should be equivalent, but confirm by inspection.
• Confirm plugins/apple-contact and plugins/pdf should indeed be excluded from the Cargo workspace (they currently have no Cargo.toml)

Suggested test plan: Since these are Rust-only changes to transcription adapter code, run cargo check --workspace and cargo clippy --workspace on a macOS build environment (where more crates compile) to verify no regressions. No runtime behavior should change.

Notes

• The 3 desktop_ci failures in CI are a pre-existing TypeScript error on main ('previewLabel' is declared but its value is never read in session-preview-card.tsx) — unrelated to this PR, which only touches Rust files and Cargo.toml. None of the failed checks are marked as required.
• Some workspace crates (audio, tcc, notch, cactus-sys) depend on macOS-only or platform-specific libraries and could not be fully clippy-checked on Linux. Warnings in those crates were not addressed.
• The audio crate has dead-code warnings (did_pop_chunk, convert_and_push_to_ringbuf, push_f32_to_ringbuf, has_buffered_samples) that remain — these are in a crate excluded from this check run.

Link to Devin Session: https://app.devin.ai/sessions/b9be01de46284a1982f5834efb9185e1
Requested by: bot_apk

[devin-ai-integration]

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