Parse the Zed-compatible .typoena.snippets.json (serde_json), strip
${n:label} stops to bare $n, and drive a forward-only tab-stop session.
Expand a prefix inline on Tab in Insert; browse and insert from the
Cmd-P palette via a $ sigil (parallel to the > command mode), landing
on $1 as one undo group.
Move the editor core out of the firmware crate (pinned to the xtensa
target, so it can't run `cargo test`) into a standalone `editor` crate,
with the panel framebuffer + geometry split into a `display` crate. Both
depend only on embedded-graphics + keymap, so the editor is now
host-buildable and unit-tested (8 characterization tests). Firmware links
them and re-exports the geometry from epd.rs; behaviour is unchanged.
The xtensa firmware build was not verified in this environment.
