Merge branch 'feat/reply-to-message' into 'dev'

backend/.gitignore

backend/app/crud.py

backend/app/main.py

backend/app/models.py

backend/app/schemas.py

frontend/global.d.ts

frontend/package-lock.json

frontend/package.json

frontend/pnpm-lock.yaml

frontend/src/lang/en.json

frontend/src/lang/fr.json

frontend/src/lib/api/sessions.ts

frontend/src/lib/components/sessions/message.svelte

frontend/src/lib/components/sessions/writebox.svelte

frontend/src/lib/types/linkify-html.d.ts

frontend/src/lib/types/message.ts

frontend/src/lib/types/session.ts

frontend/src/lib/types/svelte-gravatar.d.ts

frontend/src/lib/utils/replyUtils.ts

frontend/tsconfig.json