feat: handle missing optional patch tags for pr/ flow

- Add mbox_parser module to extract metadata from patch content
- Extract author/committer from From: and Date: headers when tags missing
- Extract commit message body as fallback for description tag
- Implement best-guess parent commit logic using committer timestamps
- Update patch_supports_commit_ids to accept mbox-parseable patches
- Enable patches without optional tags to appear as pr/ branches

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index eefba1a..71de413 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ anyhow = "1.0.98"
 async-trait = "0.1.88"
 auth-git2 = "0.5.8"
 chacha20poly1305 = "0.10.1"
+chrono = "0.4"
 clap = { version = "4.5.41", features = ["derive"] }
 console = "0.16.0"
 dialoguer = "0.12.0"