chore(store): App Store screenshot kit and the 6.9" set

[Ivan-LB]

Summary

• Design/ScreenshotKit/ — the pipeline that produces the App Store set from real screens: collect.sh (rename the XCTest attachments), compose.swift (renders each page with SwiftUI ImageRenderer on macOS, so the type is the real New York / SF Pro — nothing embedded), fixtures/receipt-corner-market.png (a rendered, fictional receipt for the scan frame), README.md (the three commands).
• Savely/Utilities/ScreenshotSeed.swift — DEBUG-only dataset behind -SavelyScreenshotSeed. It wipes the store and seeds exactly what the captions must prove: Trip to Oaxaca 42 % On track · by Dec 12, 2026 · $125/wk, Laptop 17 % Behind · by Mar 1, 2027 · $25/wk with ETA 1+ year, a $1,240 paycheck offering a $150 auto-move, a −22 % month-over-month drop in the 7-month trend, and ordinary expenses with fictional merchants. Compiled out of Release.
• SavelyUITests/StoreScreenshotTourUITests — walks the eight frames and attaches the raw 1320×2868 captures.
• TARGETED_DEVICE_FAMILY = 1 — iPhone-only for this release, so Apple does not require a 13" iPad set.
• Plan doc updated with what was produced and what is deferred.

Why

Savely needed its own storefront identity — not Alisio's colored bands, not Fingo's gradients, not Thirds' cream editorial. The direction (researched and scored in docs/plans/app-store-screenshots.md) is the warm notebook page: green tracked kicker on a hairline rule, regular-weight New York headline, the real app as a flat photo in a warm-ink bezel, and the SproutMark growing one stage per page — the splash animation's own geometry laid across the gallery. Every caption is provable in the screen under it (the "ledger check"), which is why the seed exists.

Test plan

• xcodebuild build -scheme Savely (iPhone 17 Pro Max)
• xcodebuild test -only-testing:SavelyUITests/StoreScreenshotTourUITests — 6/6 passed, 11 captures attached
• swift Design/ScreenshotKit/compose.swift build/captures build/store — 8 pages, 1320×2868
• swiftlint --strict clean on the touched files
• Output flattened to alpha-free sRGB (sips -g hasAlpha → no), 138–309 KB each
• Manual: 25 % zoom legibility check before uploading; confirm App Privacy label reads "Data Not Collected"

Risks

• The seed deletes local data when the launch argument is present — DEBUG-only, Simulator-only, never run on a device with real data.
• The set is English-only for now; the es-MX set needs the ~139 en-only strings plus the hard-coded On track / Behind / 1+ year / /wk / greeting / date-pattern literals localized first (tracked in the plan doc).
• Composition is date-sensitive (month headers, ETAs) — re-run the tour in the submission week.

Checklist

• Branch named with approved prefix (chore/)
• Commits follow Conventional Commits
• No hardcoded user-facing strings added to the app (the store copy lives in compose.swift, not in the UI)
• No secrets staged
• Docs updated
• Tests added or updated for behavior changes