settings: Live notifications — one switch each, and each hides only its own

[UtkuDenizAltiok]

What this PR does

NOOP has three live notifications — Live Activities, shown on the Lock Screen and in the Dynamic Island: the live heart rate, a Lift Log session and a strap sync (NOOPActivityAttributes, LiftActivityAttributes, SyncActivityAttributes; nothing else in the app posts one). Two had a switch, at the foot of the Strap card, worded "… in Dynamic Island". The Lift Log banner had none: it followed the live heart rate switch (its comment: "a user who turned Live Activities off meant all of them"). So someone who did not want their heart rate on the Lock Screen all day — at a desk, in bed, on a bus — lost the gym banner too, and the Lock Screen light-up a strap double-tap sends through it.

Now:

• a small Live notifications section after Strap (iOS only) holds all three switches — "Live heart rate", "Lift Log session", "Strap sync" — with one line each and one line for the section: shown on the Lock Screen and in the Dynamic Island, and a switch only hides one;
• the Lift Log banner has its own switch (UnitPrefs.liftLiveActivityEnabled, key liveActivity.lift.enabled, default on, read default-true like its siblings), checked where the controller checked the live heart rate one;
• a switched-off gym banner no longer holds the sync banner back: a sync started during a Lift Log session was held back for the gym banner even when that banner's switch was off, leaving the Lock Screen with nothing (holdsBackNewBanner). The live heart rate banner's own make-room rule is fixed, more broadly, in live HR: show only a heart rate the strap is measuring, and keep the banner until its switch turns it off #2422 (it makes room only for a banner actually on screen).

A switch decides only what is shown: the heart rate is still measured, recorded and scored, a session still runs and buzzes, a sync still runs. The two existing keys are unchanged, so current settings carry over.

Type of change

• Bug fix (the gym banner could not be kept without the everyday heart-rate one)
• Refactor / cleanup (the switches in one place, shorter wording)

How it was tested

• Full local run on 54e70c3c, every step passed: WhoopStore 611 · StrandAnalytics 2048 · StrandImport 327 · doc lint · i18n · parity ledger, ratchet, governance (124) · macOS StrandTests 2,120 (only the two locale-dependent TodayCarryOverTests) · iOS build. The head's last commit only restores main's two lines for the heart-rate banner's make-room rule and removes the helper they used (now live HR: show only a heart rate the strap is measuring, and keep the banner until its switch turns it off #2422's).
• Strings: the two row titles reuse "Live heart rate" and "Strap sync", already translated; six short new strings in all ten languages; the nine strings they replace leave the catalog (each checked unused first; every other catalog entry byte-identical).
• Simulator (iPhone 17 Pro): the section renders after Strap. With the live heart rate switch off and a Lift Log session running, advancing a set kept the gym banner in the Dynamic Island (ActivityKit's log shows no end), where the old code ended it.
• On a WHOOP 5.0 (the reporter's): each switch alone and in combination — heart rate off with the gym banner on, the gym banner off (strap log: "strap step not lighting the Lock Screen — no Lift Log banner is running"), sync on and off. Nothing on the BLE path changes.

Checklist

• UI uses only StrandDesign tokens (NoopMetrics.rowSpacing, NoopMetrics.space1, StrandFont, StrandPalette)
• Follows the conventions in docs/CONTRIBUTING.md
• I did not commit generated output (Strand.xcodeproj/) or any secrets/keystores

Related issues

Refs #336 (the live heart rate switch)

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