build(core): add #![warn(clippy::cast_lossless)]

[romanz]

warning: `trezor_lib` (lib) generated 253 warnings (run `cargo clippy --fix --lib -p trezor_lib -- ` to apply 233 suggestions)

https://github.com/trezor/trezor-firmware/actions/runs/25099514846/job/73545397242?pr=6849#step:6:3675

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[github-actions]

en main(all)

model	device_test	click_test	persistence_test
T2T1	test(all) main(all)	test(all) main(all)	test(all) main(all)
T3B1	test(all) main(all)	test(all) main(all)	test(all) main(all)
T3T1	test(all) main(all)	test(all) main(all)	test(all) main(all)
T3W1	test(all) main(all)	test(all) main(all)	test(all) main(all)

Latest CI run: 25373762654

[mmilata]

Pushed the result of cargo clippy --fix. Warnings remain for trezorhal.rs (generated) and lerp.rs, we can either add exceptions or just treat it as one time fix.