Auth firestore rules & verification improvements

[th0rgall]

• Small Firestore rule restructuring
• build: add VSCode tasks.json
• docs: mention Conventional Commits
• fix: clarify "users" & "users-private" Firebase types
• docs: adds some clarifications & ideas
• fix: tighten users & users-private firestore rules
• test: add Vitest & firestore rules unit tests
• fix: tighten validation and complete TS types in the /register page
• feat: log URLs to help with local email verification debugging
• fix: improve verification handling between independent windows
• build: discard unnecesary window for installing demo-test env
• fix: make the slug generator for chats more reliable
• chore(release): bump version for release

[github-actions[bot]]

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