feat(companion): ride timeline with zones, and the profile above the ledger

[timohueser]

Summary

The ride page gets a ride timeline, and the elevation profile moves up on the route and trip-day pages.

• The ride page order is: map, title and date, timeline, time in zones, ledger, then Replay ride.
• The timeline shows elevation, speed, heart rate, power and cadence as strips on one distance axis. It shows a strip only for channels that the ride has. Heart rate and power are coloured zone by zone. A sideways drag moves one cursor through every strip and moves a dot on the map; a vertical drag still scrolls the page. Before the first scrub, each strip shows the ride's average.
• Tapping a strip label opens a detail sheet with a larger chart, min, avg and max, and that channel's time in zones. For elevation, the line is coloured by gradient. There is no pinch-to-zoom.
• Zones come from the limits recorded with each ride (Ride.zoneLimits, feat(firmware): record each ride's effort limits, v6 ride footer #2199). If a ride has no limits, one plain line says which limit was not set.
• The model RideTimeline in OBCDomain builds the channels, downsamples them for drawing, and computes zones, time in zones and min/avg/max from every sample.
• The route and trip-day pages show the profile above the ledger.
• Sync: when the device does not answer the receipt, the app sends it again once before it shows a banner. The app logs each failure. The banner copy is plain. The ride page rebuilds when a synced ride returns at a new revision. specs/Ride_Archive_Contract.md describes the resend.
• Fixtures: effort.json has a ride with all sensors and limits, a ride with sensors but no limits, and a ride with no sensors.

Public docs

Changed. ride-detail.webp and route-imported.webp are captured again for the new order, in their own docs: commit.

Checks

• swift test in Packages/OBCKit: pass. This includes new tests for the timeline model, zone parity, time in zones and the receipt resend.
• UI suites RideTimelineUITests (new), SyncTests, RouteDetailTests, ReplayTests, TripTests, MainScreenTests and GalleryLaunchTests: pass.
• capture-website-screenshots.sh --check: pass.
• The owner tested Release builds on a real iPhone, with the Kandel sensor ride synced from the development kit.

Requirements: none

🤖 Generated with Claude Code

[coderabbitai]

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