Replace the placeholder logo with the final artwork by @clem_dreaw

[guyiome]

Summary

First real artist logo, by @clem_dreaw: a character wearing the cyan tracking mesh over half their face, i.e. literally what the app does. Closes the long-blocked "commission a real artist logo" item (todo point 62), so the placeholder era ends here.

Unlike both previous placeholders, this artwork is full-bleed (its own painted background, opaque to the edges bar a 1-2% feather) rather than a cut-out subject on transparency, which drives two changes:

• Icon: dropped drawable/ic_launcher_foreground.xml and its 12% inset. That inset existed so the husky's ears wouldn't be clipped; on full-bleed art it would instead float a rectangle of artwork inside a dark border. The bitmap is now referenced straight from ic_launcher.xml and the launcher's own mask does the cropping.
• Loading screen: clipped to a 20dp rounded square, since a raw hard-edged square read as unfinished against the dark background.

Framing was chosen by compositing both supplied files and applying a real adaptive-icon mask before deciding: despite their names they are different crops, not two sizes, and Logo_Large loses the top of the head and the chin once masked.

Known tradeoff: the mask only ever shows the central 72dp of 108, so the artwork's pink background (confined to the extreme corners) cannot survive on the icon at any framing. It stays visible on the loading screen, which applies no mask.

First .webp asset in the repo: 112 KB versus 544 KB as PNG at the same 768px, keeping this in line with the 103 KB husky it replaces instead of 5x-ing it. Verified rather than assumed: mean error 2.7/255 over opaque pixels, zero alpha error, indistinguishable at 2x zoom on the thin cyan mesh lines. Resource references are extension-agnostic, so no caller changed.

Credit string is now "Logo by @clem_dreaw", deliberately identical in values-fr (an artist handle, not a sentence to localize).

No <monochrome> layer, deliberately — lint's MonochromeLauncherIcon warning stays open by explicit decision. Monochrome source files exist but are opaque grayscale renditions, which Android would flat-tint into a solid disc; every mechanical derivation was tried and rejected, since a frame-filling portrait leaves no negative space for a silhouette.

Test plan

• ./gradlew testDebugUnitTest assembleDebug lintDebug green, no new warning attributable to this change.
• Installed on device (ASUS_I001DC) and confirmed correct by the user, both the launcher icon and the loading screen.