When 5+ users edit concurrently, revision gaps trigger the Stale state
which throws 'Ignored server-side change.' on incoming operations. This
causes document divergence, silent data corruption, and eventually
force-resets that discard local edits.
Changes:
- Stale/StaleWithBuffer.applyServer: buffer incoming operations instead
of throwing, apply them sequentially after missing ops arrive
- Stale.applyClient: carry pendingOps to StaleWithBuffer on transition
- editor-socketio-server: retry-based force-reset (3 failures) instead
of immediate nuclear reset on any OT error
- hex2rgb: defensive null checks for old non-hex color records
Signed-off-by: bxff <51504045+bxff@users.noreply.github.com>
