fix(inbox-send): preserve dots in copied filenames

send_file ran filenames through slugify(), which flattens dots to hyphens. That corrupts the engine.plugin.org plugin-namespace convention: triage-intake.personal-gmail.org arrived as triage-intake-personal-gmail.org, which breaks the engine's triage-intake.*.org glob and the routing that depends on the first dot.

I added slugify_filename() for filename stems. It keeps dots, hyphens, underscores, and case, collapses only whitespace runs to hyphens, and truncates on a separator boundary. The prose --text path still uses slugify().

0 files changed, 0 insertions, 0 deletions