feat: support TOML 1.1 multiline inline tables

Bump toml_edit to 0.25 / toml to 0.9.10 which support TOML 1.1 multiline
inline tables. Add insert_into_inline_table_with_format to preserve
multiline formatting, indentation style, and trailing comma conventions
when inserting new entries.

Includes comprehensive tests: direct unit tests for the formatting
function (trailing commas, sequential insertions, empty tables, tab
indentation, single-line fallback, existing key updates, non-dependency
tables), integration tests through TomlDocument, and consolidated
parse-only tests for upstream TOML 1.1 support. All tests use inline
insta snapshots.

https://claude.ai/code/session_01FT59TTz4yRy3DPwbREE82u

Author: claude

Cargo.lock

@@ -172,9 +172,9 @@ text_trees = "0.1.2"
 thiserror = "2.0.12"
 tokio = "1.43.0"
 tokio-util = "0.7.13"
-toml = "0.9.8"
-toml-span = "0.6.0"
-toml_edit = "0.23.0"
+toml = "0.9.10"
+toml-span = "0.7.0"
+toml_edit = "0.25.0"
 tracing = "0.1.41"
 xz2 = "0.1.7"
 # Forcing the version due to this PR https://github.com/tokio-rs/tracing/pull/3368