fix: apply cargo clippy fixes across workspace

[devin-ai-integration]

Summary

Ran cargo clippy --fix and manually applied remaining suggestions to clean up clippy warnings across the workspace.

Changes in this PR:

• Removed unnecessary .to_string() on a &str in crates/analytics/src/posthog.rs
• Collapsed nested if/if let into let-chains in:
  • crates/tiptap/src/from_ast.rs
  • plugins/fs-db/src/version/macro.rs
  • plugins/fs-db/src/migrations/v1_0_2_nightly_14_extract_from_sqlite.rs
  • plugins/fs-db/src/migrations/v1_0_2_nightly_1_from_v0.rs
  • plugins/listener/src/actors/recorder.rs
• Removed unnecessary explicit lifetime annotations in group_by_session_id in two migration files (lifetime elision suffices)
• Removed unused use tauri::Manager import in apps/desktop/src-tauri/src/lib.rs
• Added plugins/cli2 to workspace exclude list in Cargo.toml (directory lacks Cargo.toml, was causing workspace resolution failures)

All changes are linting/style fixes with no intentional functional changes to logic. All meaningful CI checks pass (macOS, Linux x86_64, Linux aarch64, fmt).

Note: The batch CI check fails due to a pre-existing cactus-sys ARM build issue on x86 runners, unrelated to these changes.

Review & Testing Checklist for Human

Risk level: Green (mechanical clippy fixes, all CI checks pass)

• Spot-check let-chain formatting — some files have extra indentation in the body (e.g., from_ast.rs, macro.rs) while recorder.rs uses standard formatting. dprint passed, but verify this variation is intentional.
• Confirm use tauri::Manager removal doesn't affect macOS runtime behavior (CI tests passed, but runtime usage may differ from test coverage)

Test plan

CI passing on all platforms (macOS, Linux x86_64, Linux aarch64) provides good coverage for these mechanical fixes. Consider spot-testing macOS desktop app startup to confirm Manager removal is safe.

Notes

• Let-chain syntax (if let X && let Y) requires Rust 1.64+; this repo uses 1.94 ✅
• Link to Devin Session: https://app.devin.ai/sessions/704d3030471644c9b19d7facb1f8ec20
• Requested by: bot_apk

[devin-ai-integration]

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