[A-EDev]

Summary

Phase 7.4 of FLOW-SYNC/2: linked devices become the default way to sync. On the Sync devices page's first step, the Linked devices section now comes first. The FLOW-SYNC/1 send and receive cards move below a divider, under a "One-time transfer" heading. The send and receive steps themselves don't change.

Copy: where the meaning changed, this PR adds new keys so other locales don't keep the old wording (only values/strings.xml is touched; the old keys are removed there):

• Settings entry subtitle: sync_devices_subtitle ("...over local Wi-Fi") is replaced by sync_devices_summary.
• Linked devices intro: linked_intro is replaced by linked_always_intro (always in sync, end-to-end encrypted).
• One-time section: sync_intro is replaced by sync_one_time_title and sync_one_time_body.

sync_devices_title and linked_title keep their text. Nightly note added.

Merge only after the owner's security audit (owner's decision).

Related issue

None.

Change type

• Bug fix
• Feature
• Refactor or maintenance
• Build, packaging, or CI
• Documentation

Validation

• ./gradlew :app:assembleGithubDebug: not run separately; the unit test task below compiled the github debug sources.
• ./gradlew --offline -Dorg.gradle.jvmargs="..." :app:testGithubDebugUnitTest --tests 'io.github.aedev.flow.sync2.*' --tests 'io.github.aedev.flow.ui.screens.sync.*' --tests 'io.github.aedev.flow.ui.screens.settings.*': 281 tests, 0 failures. --tests 'io.github.aedev.flow.TranslationFormatStringsTest': passed.
• ./gradlew --offline ... ktlintCheck: exit 0.
• python3 .github/scripts/nightly_notes.py --check: 75 nightly notes are valid.
• I manually tested the affected behavior on an Android device or emulator: not yet; part of the Phase 7 device test round.

Test device and Android version: none yet.

Risk and compatibility

UI order and copy only; no sync behaviour, storage or permission change. Removing three English keys leaves their translations orphaned until Weblate drops them.

• The change does not introduce secrets, private data, or unexpected telemetry.
• New user-facing text uses Android string resources.
• Dependency and lockfile changes are intentional and limited to this PR.
• Room schema changes include the required version bump and migration, or this PR does not change the Room schema.
• Breaking changes and upgrade steps are clearly documented.

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