ios: add minimal launch screen

[azooz2003-bit]

Cold launch previously showed a bare blank system-background screen (empty UILaunchScreen dict). This declares a minimal static launch screen: the cmux chevron mark (34x48pt) centered on a LaunchBackground color that matches the first screen's plain systemBackground (white in light, black in dark).

The mark is rendered from the canonical brand chevron in web/public/cmux-icon.svg (gradient #12c7f5 -> #2d8cff -> #6c5cff). The first cut used the app-bundled CmuxLogo raster, whose gradient is noticeably more purple than the brand mark on cmux.com; that asset (still used by the sign-in header) remains off-brand and is a candidate for a separate alignment PR.

HIG check: followed the Launching page (https://developer.apple.com/design/human-interface-guidelines/launching). The launch screen is static with no text, matches the device appearance mode, and matches the first screen's solid background. The HIG discourages standalone branding; the mark is small, and the sign-in first screen already shows the same chevron in its brand header.

Localization audit: no user-facing strings added (launch screens cannot carry localized text, which is why there is no text).

No pbxproj changes; the new colorset and imageset live inside the already-referenced ios/cmux/Assets.xcassets.

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between 24659c4 and 775cd1a.

⛔ Files ignored due to path filters (3)

• ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo.png is excluded by !**/*.png
• ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo@2x.png is excluded by !**/*.png
• ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo@3x.png is excluded by !**/*.png

📒 Files selected for processing (3)

• ios/Config/Info.plist
• ios/cmux/Assets.xcassets/LaunchBackground.colorset/Contents.json
• ios/cmux/Assets.xcassets/LaunchLogo.imageset/Contents.json

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📝 Walkthrough

Walkthrough

The iOS launch screen now references an adaptive light/dark background color and a logo image set. The asset catalog includes metadata for the background and universal 1x, 2x, and 3x logo assets.

Changes

iOS launch screen

Layer / File(s)	Summary
Launch screen assets and wiring ios/Config/Info.plist, ios/cmux/Assets.xcassets/LaunchBackground.colorset/Contents.json, ios/cmux/Assets.xcassets/LaunchLogo.imageset/Contents.json	UILaunchScreen references LaunchBackground and LaunchLogo. The color asset defines white for light mode and black for dark mode. The image set defines universal 1x, 2x, and 3x logo assets.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 775cd

The PR adds a static branded launch screen with adaptive background colors and introduces no user-facing text or localization changes; no actionable merge-blocking risk remains.

Suggested reviewers: lawrencecchen

🚥 Pre-merge checks | ✅ 24 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains what changed and why, but omits the required Testing, Demo Video, Review Trigger, and Checklist sections.	Add the missing template sections, document test results and manual verification, include a demo video or attachment, and complete the checklist.

✅ Passed checks (24 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (3 skipped: 3 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Cmux Swift Actor Isolation	✅ Passed	The PR changes only Info.plist and asset-catalog files; the verified commit diff contains no .swift paths, so it introduces no Swift actor-isolation issue.
Cmux Swift Blocking Runtime	✅ Passed	The PR diff changes only Info.plist and asset-catalog files; it introduces no Swift files or blocking/timing synchronization APIs.
Cmux Browser Automation Off-Main	✅ Passed	The PR diff contains only iOS launch-screen plist and asset files; it changes no browser automation, worker router, policy, or policy-test paths.
Cmux Expensive Synchronous Load	✅ Passed	The PR changes only Info.plist and launch-screen asset files; the parent diff contains no Swift changes or expensive synchronous agent-history loads.
Cmux Cache Substitution Correctness	✅ Passed	The pull-request diff changes only Info.plist, asset-catalog JSON, and PNG files; it introduces no production Swift, TypeScript, or JavaScript cache substitution.
Cmux No Hacky Sleeps	✅ Passed	The PR diff contains only Info.plist and Xcode asset catalog JSON/PNG files; it introduces no TypeScript, JavaScript, shell, build/runtime script, or timing delay.
Cmux Algorithmic Complexity	✅ Passed	The diff adds only Info.plist metadata, asset JSON, and PNG files; it changes no production Swift, TypeScript, JavaScript, or shell code covered by the complexity rule.
Cmux Swift Concurrency	✅ Passed	The parent-to-HEAD diff changes only Info.plist and asset files. It contains no Swift paths or new concurrency constructs, so this check is inapplicable.
Cmux Swift @Concurrent	✅ Passed	The diff contains only Info.plist, asset JSON, and PNG files; it contains no Swift paths or async/concurrency changes, so this check is inapplicable.
Cmux Swift Package Boundaries	✅ Passed	The PR diff contains only Info.plist, asset JSON, and PNG files; it introduces no production Swift or SwiftPM target changes covered by this check.
Cmux Swiftpm Lockfiles	✅ Passed	The PR diff only changes ios/Config/Info.plist and adds launch assets; it changes no Package.swift, Package.resolved, .gitignore, workflow, or Xcode project package references.
Cmux Swift Logging	✅ Passed	The PR diff changes only Info.plist and asset files. It adds no Swift/runtime files or logging statements.
Cmux User-Facing Error Privacy	✅ Passed	The diff only adds static launch-screen configuration and image/color assets; it adds no user-facing errors, alerts, output, recovery copy, or sensitive diagnostics.
Cmux Full Internationalization	✅ Passed	The diff adds only launch-screen asset/config identifiers and a developer comment; it adds no user-facing text or localization keys, and no catalogs or locale entries require updates.
Cmux Swiftui State Layout	✅ Passed	The PR diff contains only Info.plist, asset JSON, and PNG files. It adds no SwiftUI source or state/layout constructs, so this check is inapplicable.
Cmux Architecture Rethink	✅ Passed	The diff contains only Info.plist and asset-catalog changes; it introduces no Swift code, lifecycle owner, timing repair, observer, side channel, or duplicate entrypoint wiring.
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	The PR diff changes only ios/Config/Info.plist and asset-catalog files; it adds no Swift window code or close-shortcut behavior covered by the rule.
Cmux Source Artifacts	✅ Passed	The diff adds only Info.plist launch-screen configuration and small LaunchBackground/LaunchLogo asset-catalog files, including 36x48, 72x96, and 108x144 PNGs; no scratch or generated artifact paths...
Cmux No Test Or Debug Seam In Production Source	✅ Passed	The PR diff contains only Info.plist, JSON asset metadata, and PNG files; it adds or changes no Swift file under a production Sources path.
Cmux No Ambient Global State	✅ Passed	The pull-request diff changes only Info.plist, asset JSON files, and PNGs; it contains no .swift paths or production Swift declarations.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a minimal iOS launch screen.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat-ios-launch-screen

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[greptile-apps]

Greptile Summary

The PR replaces the empty iOS launch-screen declaration with a centered cmux mark on an appearance-aware background.

• Adds named light and dark launch-background colors.
• Adds correctly scaled 1x, 2x, and 3x launch-logo assets.
• Connects both assets through the existing UILaunchScreen configuration.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
ios/Config/Info.plist	Configures the static launch screen to use the new named background color and logo assets.
ios/cmux/Assets.xcassets/LaunchBackground.colorset/Contents.json	Defines universal white and dark-appearance black launch backgrounds.
ios/cmux/Assets.xcassets/LaunchLogo.imageset/Contents.json	Declares complete universal 1x, 2x, and 3x launch-logo resources.
ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo.png	Adds the deliberate 34×48-point-scale launch mark.
ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo@2x.png	Adds the correctly scaled 68×96-pixel launch mark.
ios/cmux/Assets.xcassets/LaunchLogo.imageset/LaunchLogo@3x.png	Adds the correctly scaled 102×144-pixel launch mark.

_{Reviews (3): Last reviewed commit: "ios: match launch logo gradient to the s..." | Re-trigger Greptile}