Prompt user to install BadgeBot from HexDrive EEPROM app when no controlling app is detected

[Copilot]

When a HexDrive hexpansion is inserted but no controlling app (BadgeBot or otherwise) interrogates it within 5 seconds, the EEPROM app should bring itself to the foreground and prompt the user to install BadgeBot. The prompt should only fire once, persisted via settings.

Changes to hexdrive.py

• Interrogation detection — get_version() now sets self._interrogated = True. BadgeBot always calls this method first, making it the natural signal that a controlling app is present.

• Timed prompt trigger — background_update() accumulates elapsed time. After _PROMPT_DELAY_MS (5 s) with no interrogation and no prior prompt, it emits RequestForegroundPushEvent(self) and writes settings.set("hexdrive.prompted", True) so the prompt fires exactly once across reboots.

• Foreground screen — New draw() method renders a simple "Install BadgeBot" message. New _handle_gain_focus / _handle_lose_focus handlers register/deregister a ButtonUpEvent listener; any button press dismisses via RequestForegroundPopEvent.

• State initialised before config guard — _interrogated, _time_since_start, _in_foreground, and _prompted are set unconditionally so get_version() and draw() are safe to call regardless of whether config was provided.

# background_update() — core of the new logic
if not self._interrogated and not self._prompted:
    self._time_since_start += delta
    if self._time_since_start > _PROMPT_DELAY_MS:
        self._prompted = True
        settings.set(_PROMPT_SETTING, True)
        eventbus.emit(RequestForegroundPushEvent(self))

Original prompt

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This section details on the original issue you should resolve

<issue_title>prompt use of BadgeBot app</issue_title>
<issue_description>if hexpansion with EEPROM app is installed it can time a short delay and then if it has not been interrogated by the BadgeBot (or any other) application, it can raise request to go foreground and show a simple screen to prompt user to install BadgeBot.
Perhaps needs to remember that it has done this and not do it again to avoid being a pain if a HexDrive is left plugged in.</issue_description>

<agent_instructions>this must only edit the app file that goes into hexdrive eeprom.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@lincoltd7 @copilot

• Fixes prompt use of BadgeBot app #59

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