fix: tap mapped to gamepad button not firing

[BANANASJIM]

Summary

• Fix gamepad button taps being invisible to state-polling applications (SDL, XInput)
• Replace synchronous press+release in emit_tap with the existing injected_buttons_/injected_ext_ injection mechanism so the button persists for one full HID poll period

Closes #25

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4153c77c-f511-4f16-a260-47b525a7bed7

📥 Commits

Reviewing files that changed from the base of the PR and between 53e123a and a179358.

📒 Files selected for processing (1)

• src/gamepad.cpp

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