[Nutcasey]

Part 3 of 6 splitting #2621. Builds on parts 1 and 2 (#2637, #2638). Review commit 2a92d656.

Now replaces the classic status screen's HUD and charts with one screen.

• Top: the current glucose with its trend and target, and Loop's state in words.
• Tiles: the pump and CGM, IOB, COB and the current basal against plan.
• Actions: Add carbs, Bolus and Presets.
• Charts: the next three hours with Loop's prediction, and today so far on one timeline.
• Notices: device and Loop problems are written out, and each opens the screen that fixes it.

Now is StatusTableViewController's table with new rows, so every existing flow keeps working from it:

• bolus progress and cancel, suspend and resume, alerts and presets
• the insulin delivery log, carb absorption and the prediction breakdown
• pump and CGM settings and the last Loop error
• deep links and activity restoration

The last-error check compares with Loop's last completion rather than the HUD's, because Now has no HUD.

Tabs. Trends and the Logbook become tabs. Settings stays a sheet: its tab selects Now and presents Settings from there, because device and service screens open through StatusTableViewController. Deep links select Now first.

New Interface toggle. A toggle in Settings switches back to next-dev's classic status screen with its action tabs. The new interface is on by default.

Differences from #2621

• Ported to Use LoopKit's value types and bridge to LoopAlgorithm #2635. NowModel uses LoopCoreConstants.inputDataRecencyInterval and maps the prediction through .loopKit, as LoopDataManager.predictedGlucose does.
• Classic mode keeps Trends and the Logbook in Settings, beside Statistics, as parts 1 and 2 added them. In Add a redesigned interface with Now, Trends and Logbook tabs (next-dev) #2621 classic users had neither. With the new interface on, all three Settings rows are hidden, because the tabs cover them, as Add a redesigned interface with Now, Trends and Logbook tabs (next-dev) #2621 hid Statistics.
• DayTimelineCard and DayTotalsTiles come from DayDetailView.swift (part 1), not NowScreen.swift.
• Add carbs keeps the classic form until part 4. The app-group mirror for the widget arrives in part 5, and the appearance row in part 6.
• Review fix: removes NowModel.lastLoopFailed, which was set but never read.

Testing

On the loop simulator, through XCUITest:

• Now → Today so far → day page → back. Trends and Logbook tabs.
• Settings tab: New Interface on, no Statistics, Trends or Logbook rows.
• New Interface off: Settings closes and the classic screen returns. Settings then has Statistics, Trends and Logbook. Back on: the tabs return.
• Add carbs from Now opens the classic form.
• Loop://carb-entry from the Logbook tab selects Now and opens carb entry.

LoopTests (449 run on this part, on next-dev 5ee95cc6): all pass except BolusEntryViewModelTests.testCarbEntryDateAndAbsorptionTimeString and …String2, which fail the same way on plain next-dev ("12:00 PM" against "12:00"). Xcode's hosted test run stalls at test-host launch on this machine, so these ran in the app bundle under Xcode's simulator XCTest agent, with next-dev's test classes except the HealthKit-hosted DeviceDataManagerTests. Every part was built on its own, in order, on the loop simulator.

The series

#2621 is split into six PRs, in the order Pete suggested: statistics and Trends first, then the Logbook, then the home screen. Add carbs, the widget and Live Activity, and the appearance options follow as their own parts. Each part builds on the one before it and targets next-dev (5ee95cc6, after #2635), so a PR shows the earlier parts' commits too. Review only the last commit of each PR (part 1 has two: Trends, then what came across from Statistics). #2621 stays open as the combined reference until the series lands.

1. [1/6] Add a Trends screen for glucose, insulin and Loop status #2637 Trends, opened from Settings
2. [2/6] Add a Logbook of the last 7 days #2638 Logbook, opened from Settings
3. [3/6] Add the Now home screen with Now, Trends, Logbook and Settings tabs #2639 Now home screen with Now, Trends, Logbook and Settings tabs, and the New Interface toggle
4. [4/6] Rebuild Add carbs around a live preview of the meal #2640 Redesigned Add carbs
5. [5/6] Restyle the widget, Dynamic Island and Live Activity for the new interface #2641 Widget, Dynamic Island and Live Activity
6. [6/6] Add Day and Night app icons and an appearance setting #2642 Day and Night app icons and the appearance setting

The six parts together match #2621 apart from the changes listed under "Differences from #2621" in each part.

Merging. Merged in order with merge commits, all six apply cleanly. With squash merges, each next PR needs a rebase onto next-dev once the previous one lands, because it still carries the earlier part's original commit. I've checked that every one of those rebases applies cleanly and that the end result is identical to part 6. I'll rebase each PR as the one before it merges.

Strings. Each part adds only its own catalogue entries, with their translations in Loop's languages, and fills in translations for the existing keys it starts using. GitHub's line diff of Localizable.xcstrings can show deletions where Xcode's ordering interleaves new keys. Parsed as JSON, no part removes or rewrites any existing entry.

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