feat(tui): render session forms

[rekram1-node]

Summary

• render typed and URL forms for the active session in the TUI
• track form lifecycle events and refresh the active session when its route loads
• add form notifications while preserving the existing question flow

Stack

1. This PR
2. refactor(core): route questions through forms #35422
3. fix(tui): scope global forms by location #35423

Follow-up

• V2: reconcile pending TUI blockers after reconnect #35447 tracks pending permission/form reconciliation after reconnect

Tests

• bun test test/cli/tui/data.test.tsx test/cli/cmd/tui/notifications.test.ts (27 pass)