v1.4.6

Release APK build for v1.4.6.

Signed with the project's checked-in keystore (stable since v0.4.15). Sideload-only distribution today.

What's Changed

• docs: Data Safety checklist + correct §4 deletion path (#1139) by @jphein in #1352
• fix(#1319): warmup-message plumbing + Supertonic speaker-layout audit by @jphein in #1353
• docs(privacy): drop stale v0.5.x version pin from the backend list by @jphein in #1355
• docs: Play Store readiness reference (#1302) by @jphein in #1356
• docs: Play Store walkthrough v2 + listing + screenshot plan by @jphein in #1357
• fix(reader): use current LinearProgressIndicator lambda overload by @jphein in #1358
• docs: refresh + reconcile Play Store listing brief for v1.4.5 by @jphein in #1359
• docs: correct sign-out ≠ deletion claim across 5 docs by @jphein in #1361
• docs(play-store): fix live listing for Play upload — under-limit + de-storyvox by @jphein in #1362
• docs(play-store): sync live short-description to canonical wording by @jphein in #1364

Full Changelog: v1.4.5...v1.4.6