refactor(web): colocate modules and remove dead scaffolding

[tyler-dane]

Summary

• Delete dead one-off helpers and core mock fixtures (events.misc, web.test.util, SpaceCharacter, db-errors.util, thin Google auth re-export).
• Colocate misplaced modules next to their owners (calendar.api → api/, cmd constants → CommandPalette, local-event.record → events, release-notes store → ReleaseNotesPrompt, auth/google env helpers out of generic env).
• Slim the release-notes prompt store while keeping reload-survive scheduling and the e2e bridge.

Simplicity

Net complexity down: deleted ~400 lines of dead/misplaced code and colocated the rest. Follow-up simplify commit DRY'd release-notes open/close, Google MSW event helpers, and auth defaults, and fully inlined the DatePicker default-export unwrap. No useEffect / useRef / useState added or removed.

Manual Testing Steps

This change is structural (moves/deletes/colocations) with no intentional UI behavior change. Reviewers can spot-check:

• Load the week view and confirm all-day event titles still render (trailing non-breaking space preserved)
• Open the command palette and confirm create/navigation/more commands still appear
• Confirm Google connect / reconnect still starts the consent flow when Google is configured
• After a new signup, confirm the release-notes prompt still opens after ~45s (including across a mid-delay reload)

Test plan

• Correctness review on the cleanup diff — no issues found
• bun type-check
• bun lint (errors clean; existing nursery class-order warnings only)
• bun test:web focused suites (app-init, datetime util, google-auth-config, env constants, cmd constants, local-event.record, session.util, google-reconnect toast, AuthModal) — all passing
• Simplify follow-up commit with re-verify

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