Typing a header line above the draft marker (`#`/`##`/… + the start of a
field name) now shows an autocomplete popup: Tab/Enter or click to insert
"Field: ", Up/Down to choose, Esc to dismiss (and stay dismissed until the
partial changes). It never triggers in the prose below the marker.
Suggestions combine a built-in list (Title, Slug, POV, Word Count Target,
Characters, Setting, Conflict, …) with field names learned from every
file's header, refreshed on open and merged on save, so custom fields
autocomplete too.
Implementation: the editor gets a stable id so completions can drive its
cursor/focus; nav keys are consumed before the TextEdit sees them, and the
popup is recomputed from the caret each frame. Pure helpers
(header_completion_context, field_matches, header_field_names) are unit
tested; 50 tests pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N9kRuP7JvXoUGdNNeg5ZSs
landon
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