The injected MainActivity overrode Capacitor's WebViewClient, wiping out the
client Capacitor needs to load the web layer — causing a black-screen crash on
launch. Remove the MainActivity template, its injection script, and the build
wiring. The real signing fix (setPackageName before signEvent) is unaffected and
remains in place. Bump to 1.2.10.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
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