chore: bump version to 0.2.6

refactor: reorganize codebase into src/ directory

fix: address PR review feedback

Update copyright year in LICENSE file

feat: improve rules editor UX and bump version

add reference to wiki

removed a settings header to avoid possible controversy

add to github

non functional update: spellcheck in comments

changed header to Custom rules

Header changed from General to Auto Math Settings

Fixed: use sencence for UI text, plugin name in settings headings

Updated main.ts with all required fixes:

returned Smart Limits

Changed \inf → \inf_ to prevent conflicts with \infty (follows same pattern as \lim_ from v0.2.1