Svelte 5 porting

.env.example

.gitignore

.pre-commit-config.yaml

.prettierignore

.vscode/settings.json

LICENSE.md

README.md

css_variant_extender.py

db/data/DS_14stud_84subs_7types.json

db/data/DS_170stud_611subs_4types.json

db/data/DS_21stud_81subs_4types.json

db/data/DS_9stud_36subs_4types.json

db/data/dev_exam_data.json

db/dev_data/DS_14stud_84subs_7types.json

db/dev_data/DS_170stud_611subs_4types.json

db/dev_data/DS_21stud_81subs_4types.json

db/dev_data/DS_9stud_36subs_4types.json

db/dev_data/parse.ts

db/dev_data/tmp.json

db/export.surql