Apply cargo clippy fixes

[devin-ai-integration]

Apply cargo clippy auto-fixes

Summary

Ran cargo clippy --fix across the workspace and applied the resulting suggestions. Changes:

• Cargo.toml: Added plugins/cli2 to workspace exclude list (it has no Cargo.toml, only node_modules, and was breaking workspace resolution via the plugins/* glob).
• crates/analytics/src/posthog.rs: Removed redundant .to_string() on a &str already satisfying the expected type.
• crates/tiptap/src/from_ast.rs, plugins/fs-db/src/migrations/..., plugins/fs-db/src/version/macro.rs: Collapsed nested if/if let blocks into let-chains (clippy::collapsible_if / clippy::collapsible_match). Also elided unnecessary explicit lifetime parameters where Rust can infer them.

Note: Some workspace crates depending on libspa/pipewire could not be compiled on the build environment due to a system library version mismatch, so their clippy output was not captured.

Review & Testing Checklist for Human

• Verify let-chain semantics in from_ast.rs: The collapsed if c == '\\' && let Some(&next) = chars.peek() && is_markdown_escapable(next) must behave identically to the original nested version — confirm result.push(c) still executes for all non-matching cases.
• Confirm project is okay with let-chains syntax: Requires Rust 1.87+. The toolchain file pins 1.92.0, but verify this won't break any other build targets or CI.
• plugins/cli2 exclude: Confirm this directory is intentionally JS-only and should be excluded from the Cargo workspace.

Notes

• Requested by: unknown
• Link to Devin run

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[devin-ai-integration]

Devin Review found 0 potential issues.