tui: rework deferred-termcodes ... again

- Revert timer-based approach.
- Instead, call loop_poll_events() with a timeout in an "active" loop,
  to infer that "TUI startup activity has mostly finished", but also to
  enforce a mininum time (100 ms) before emitting "enable focus
  reporting" termcode. (If TUI startup takes longer than that minimum
  time, it's probably a slow environment anyways.)
- Tickle `main_loop` by sending a dummy event.  Without this, the
  initial "focus-gained" response from the terminal may not get
  processed until the user hits a key.

ref #7720
ref #7664
ref #7649
ref #7664
ref 27f9b1c7b029d8

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