fix nav drawer gesture on all screens (#43)

[Vaibhav-S-Gowda]

What this PR does

Fixes the navigation drawer swipe gesture so it works on all screens (Settings, About, Debug Log), not just the home screen. Closes #43.

Why

When the drawer is closed, NavigationDrawer.on_touch_down calls self._main_panel.on_touch_down(touch) directly for any touch outside the left-edge zone. On child screens like Settings and Debug Log, the main panel's widgets consume the touch and return True, so the drawer gesture never gets a chance to grab it. The home screen happened to work because its layout left the left edge uncovered.

How

Three changes:

• Added BusKillNavigationDrawer subclass in src/buskill_gui.py that overrides on_touch_down to grab left-edge touches before dispatching to children
• Updated src/buskill.kv to use BusKillNavigationDrawer instead of NavigationDrawer
• Fixed on_touch_down in src/packages/garden/navigationdrawer/__init__.py to guard _main_panel touch dispatch with a col_main check

Testing

Tested swipe gesture on:

• Home screen (was already working)
• Settings screen (was broken, now fixed)
• About screen (was broken, now fixed)
• Debug Log screen (was broken, now fixed)

Tested on: Linux (Ubuntu 24.04), Kivy 2.3.1

Untested on: macOS, Windows

[maltfield]

Hey @Vaibhav-S-Gowda thanks for the PR :)

Unfortunately, I realized that we don't yet have a process for contributors. I'm currently in the process of fixing that here:

• Setup CAA for Contributors #110

Please note that we also have a policy not to include contributions from AI:

• https://github.com/BusKill/buskill-app/blob/f21531dd9e5c40958520109cf6b0dcc484081fbf/CONTRIBUTING.md#ai-policy

Can you please indicate if you wrote this code yourself, or if you used AI to write this code?

[maltfield]

@Vaibhav-S-Gowda can you please send us an email so we can send you the CAA?

• https://buskill.in/contact

[Vaibhav-S-Gowda]

Hey @Vaibhav-S-Gowda thanks for the PR :)

Unfortunately, I realized that we don't yet have a process for contributors. I'm currently in the process of fixing that here:

• Setup CAA for Contributors #110

Please note that we also have a policy not to include contributions from AI:

• https://github.com/BusKill/buskill-app/blob/f21531dd9e5c40958520109cf6b0dcc484081fbf/CONTRIBUTING.md#ai-policy

Can you please indicate if you wrote this code yourself, or if you used AI to write this code?

Thanks for checking. To be transparent I used AI assistance for portions of this contribution roughly 60% of the code. I understand if that doesn't align with your contribution policy. Happy to rewrite it manually if that's preferred, or close the PR if not.