fix: wrap every route in error boundary with working try again reset

[waterWang]

Summary

Wraps every route in the app with an ErrorBoundary that provides a meaningful fallback UI and a working "Try Again" button. Route changes automatically recover from error states.

Changes

ErrorBoundary.tsx — New capabilities

• onReset prop: Called when the boundary resets (e.g. user clicks "Try Again")
• resetKeys prop: When keys change, the boundary auto-recovers — enables route-based recovery
• "Try Again" wiring: The render method injects a real onReset handler into the fallback element when it doesn't already have one, so the "Try Again" button in ErrorFallback actually clears the error state
• Console stack trace: componentDidCatch now logs console.error(...) with the error and component stack

App.tsx — Route boundary unification

• New RouteBoundary component that uses useLocation().pathname as resetKeys — navigating away from a crashed route automatically recovers
• Wraps every route (including /login and /auth-callback) in RouteBoundary
• Simplifies pattern: removes the onReset={() => {}} no-op from all route fallbacks

main.tsx — Root boundary now uses real reset

• Removed the onReset={() => {}} no-op from the root ErrorBoundary; the component now injects the real handler automatically

Acceptance Criteria

• Every route wrapped in ErrorBoundary
• Fallback shows error message and "Try Again" button
• Error doesn't propagate to parent routes
• Console shows component stack trace in dev mode