[MotherSphere]

Bumps the tauri pin from 2.12.1 to 2.12.2 (the latest release on crates.io) and refreshes src-tauri/Cargo.lock so transitive crates pick up their latest compatible versions.

Lockfile changes from cargo update:

• tauri 2.12.1 -> 2.12.2
• tokio-util 0.7.19 -> 0.7.20
• toml 1.1.7 -> 1.1.8
• toml_edit 0.25.16 -> 0.25.17
• toml_parser 1.1.4 -> 1.1.5

Every other direct dependency is already at its latest crates.io stable release (tauri-build 2.7.1, tauri-plugin-dialog 2.8.1, tauri-plugin-opener 2.7.0, serde 1.0.229, serde_json 1.0.151, dirs 7.0.0, percent-encoding 2.3.2, comrak 0.56.0). All updated crates declare a rust-version at or below the crate MSRV (1.90).

Verification:

• cargo check --locked --all-targets passes on Linux.
• cargo test --locked: 8 passed.
• CI runs the full matrix (3 OS, clippy, MSRV).