Implement a chord-mode unicode entry system activated by Fn1+LeftAlt
(CHORD_KEY). Supports two activation styles: tap CHORD_KEY then type
the sequence within a 2-second window, or hold CHORD_KEY, type the
sequence, and release to commit.
- Add chord_unicode.c/h with a ~110-entry table covering math symbols
(°²³√≈≠≤≥±÷×∞π), Greek letters, currency, fractions, arrows,
typography, and a broad emoji set
- Prefix-aware matching with a 300ms disambiguation timer handles
same-prefix alias pairs (e.g. lte/lteq→≤, inf/infty→∞) cleanly
- Backspace deletes, Enter confirms, Escape cancels while in chord mode
- Modifier and layer key-up events pass through so TT(FN1) release
correctly deactivates the layer while chord mode is active
- Enable UNICODE_ENABLE and wire chord_unicode.c into the build
rootiest
c819c83b80
