Walkthrough ships placeholder images; mostro_logo.png is missing

[AndreaDiazCorreia]

The walkthrough (first-run onboarding) renders flat grey rectangles instead of illustrations, on every platform. The assets in the repo are placeholders that were never replaced.

Walkthrough images are placeholder PNGs

assets/images/wt-{1..6}.png are all 817-byte, 400x300 PNGs, and there are only two unique files alternated across the six slides:

040b491a8ae19e5019dfe620fed6b664  wt-1.png
164c3dd420778ac0a0e36aaac0b366b7  wt-2.png
040b491a8ae19e5019dfe620fed6b664  wt-3.png
164c3dd420778ac0a0e36aaac0b366b7  wt-4.png
040b491a8ae19e5019dfe620fed6b664  wt-5.png
164c3dd420778ac0a0e36aaac0b366b7  wt-6.png

Decoded, each is a solid-colour rectangle: rgb(30,34,45) (#1E222D) and rgb(35,38,50) (#232632). Those tones are nearly identical to the dark app background, so the slide reads as an empty area with a faint block in it.

git log -- assets/images/ on main shows a single commit, 0111871 feat(setup): phase 1 — project initialization — the assets have not been touched since the initial scaffold.

They are consumed by lib/features/walkthrough/screens/walkthrough_screen.dart:147:

image: Padding(
  padding: const EdgeInsets.only(top: 30),
  child: Image.asset(
    slide.image,
    height: 200,
    fit: BoxFit.contain,
    errorBuilder: (_, __, ___) => const SizedBox(height: 200),
  ),
),

Note this is not a web/asset-loading bug: the images do load, they are just blank. The errorBuilder would render nothing at all if the asset were missing.

mostro_logo.png is missing

lib/features/trades/screens/trades_screen.dart:140 references assets/images/mostro_logo.png, but the only files tracked under assets/images/ are the six wt-*.png. That asset load does fail.

Scope

• Decide where the real walkthrough illustrations come from (parity with v1 MostroP2P/mobile, or new artwork) — needs a design call.
• Replace wt-{1..6}.png with six distinct illustrations, sized for the height: 200 / BoxFit.contain slot and legible on both dark and light themes (see Visual QA pass on light theme (trade_detail and other dense screens) #116).
• Add assets/images/mostro_logo.png (or drop the reference in trades_screen.dart).