Compose now prompts Keep / Discard on Cancel when the top-level body
is non-empty. The default action keeps the draft (matching the silent
behaviour we had before), but users who want to start fresh can now do
so from inside the sheet without having to tap-and-hold the TextEditor
to select and delete.
Profile view becomes `.searchable()` with a case-insensitive substring
match on post body + tags. The filter runs locally on the parsed profile
so it's cheap even on large feeds.
TODO.org gains a "Post-1.0 enhancements" section summarising every
interaction-fidelity, timeline, compose, render, network and test
change landed during this review pass.
andros
8e01a953dc