bug: normalizeDiaryPath does not expand ~ to home directory

[compoodment]

Summary

normalizeDiaryPath() uses path.resolve() on the raw configured path. path.resolve("~/dreams.md") resolves to <cwd>/~/dreams.md, not the user's home directory.

Impact

A natural Unix-style config value like dreamPromotionDiaryPath: "~/dreams.md" fails allowed-root validation with a confusing error.

Fix Path

PR #202 expands ~ to os.homedir() before resolving and applying allowed-root checks.

Verification Target

• Unit test for ~/... diary path expansion.
• Unit test proving allowed-root validation still rejects paths outside allowed roots after expansion.

– Vale