feat(app): bump to 1.12

versionCode 12 → 13, versionName 1.11 → 1.12.

Constraint: versionCode must be strictly increasing for sideload update checks.
Confidence: high
Scope-risk: local
Reversibility: trivial
Directive: none
Tested: assembleDebug BUILD SUCCESSFUL
Not-tested: Play Store / update server manifest sync
Related: v1.12 / vc13

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