Fix the reset button doing nothing or looping the start screen when pressed repeatedly (#719)

* Make the reset button reliable from any screen

Pressing reset repeatedly near app start could do nothing, fade the music
with no reset, or bounce the press-start screen back to itself. Three
defects in the old handler:

- It ran from the ImGui widget, racing the menu state machine; a press
  landing mid-fade was re-advanced by the in-flight transition (the
  press-start loop).
- It always wrote gGamestateNext = MAIN_MENU_FROM_QUIT; once the game was
  already in that state a repeat write is swallowed by the != guard in
  main.c, so nothing happened.
- CM_ResetAudio ran unconditionally, so the music faded even when the
  reset was swallowed.

The widget now only sets an atomic request flag; ApplyPendingReset (top of
push_frame, on the game loop) performs the reset. It alternates between
the two identical FROM_QUIT gamestates so every press trips the gamestate
switch, and re-enters the menus through the intro's own transition
protocol (FADE_MODE_LOGO -> setup_menus rebuild + fresh fade-in), which
replaces any in-flight transition. Audio only fades when a reset actually
executes. The dead gSkipIntro switch in the old handler (an unconditional
override below it always won) is gone; behavior is unchanged: reset lands
on the logo intro, or the start menu in debug mode.

Play-verified: hammering reset during the splash screens restarts the
logo every press; reset mid-fade after press-start no longer loops back;
resets from the main menu and mid-race work as before.

* Honor gSkipIntro when picking the post-reset screen

Review feedback on #719: restore the gSkipIntro switch from the old
handler instead of hard-coding the logo intro, keeping the debug-mode
override on top (no else), matching the boot-time logic in main().

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: MegaMech <MegaMech@users.noreply.github.com>

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