electrobun-counter example missing `icons/icon.ico` — breaks `cargo check` for app crate

[devallibus]

Summary

Running cargo check --workspace in examples/electrobun-counter/src-tauri/ fails because the counter-app crate's Tauri build script requires icons/icon.ico, which does not exist in the example.

Reproduction

cd examples/electrobun-counter/src-tauri
cargo check --workspace

Error

error: failed to run custom build command for `counter-app v0.1.0`

  `icons/icon.ico` not found; required for generating a Windows Resource file during tauri-build

Impact

• cargo check -p counter-core -p counter-commands works fine (the core game logic and webtau command crates compile without issue).
• Only the counter-app (Tauri desktop shell) crate fails, and only on Windows where tauri-build requires an .ico resource.
• The other examples (counter, pong, battlestation) likely have the same setup since they share the same 4-crate workspace pattern — worth checking if they have icons or exhibit the same issue.

Suggested fix

Add a default icons/icon.ico (and optionally icon.png for other platforms) to examples/electrobun-counter/src-tauri/app/icons/, matching the pattern used by tauri init scaffolds.

Context

Found during local v0.7.0 Electrobun verification (post-release). All non-Tauri-app crates in the workspace compile and test cleanly.