Add a gea.designWidth manifest field

[skyturkish]

Adds a gea.designWidth manifest field: the logical CSS width an app's stylesheets were authored for. Shells that render at an arbitrary size (phones, resizable desktop windows) divide their real width by it to get the device pixel ratio, so a layout drawn for a small panel scales to fill the surface instead of being magnified or left in a corner. weather declares 273.

Related PRs (merge core first):

• core: Engine fixes for the weather cross-platform example core#60
• docs: https://github.com/geastack/docs/pull/1
• android: Render the weather example correctly on Android android#1
• apple: Render the weather example correctly on macOS and iOS apple#3
• windows: Scale to gea.designWidth and render the weather example correctly on Windows windows#6
• simulator: Inline the app's .env in the web dev server simulator#8
• examples: Make weather a cross-platform example (Android, iOS, macOS, Windows) examples#2

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • App design-width settings now accept a positive number or numeric string. Missing, null, or empty values default to 0; other values that cannot be normalized to a finite positive number are treated as invalid.
• Bug Fixes
  • App validation now reports invalid design-width values.
  • App summaries now include the normalized design-width setting, making the configured value visible.

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 03d48634-c39d-40f3-b3b1-2817fcc02bea

📥 Commits

Reviewing files that changed from the base of the PR and between 719501e and 802823d.

📒 Files selected for processing (1)

• src/manifest.mjs

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📝 Walkthrough

Walkthrough

The manifest normalizes gea.designWidth, validates the normalized value, and includes it in the app summary.

Changes

Design width handling

Layer / File(s)	Summary
Normalize and report design width src/manifest.mjs	normalizeDesignWidth maps absent, null, and empty values to 0. It retains finite positive numbers and maps other values to NaN. normalizeApp stores the normalized value, validateApp reports NaN, and appSummary includes the value.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Suggested reviewers: dashersw

Merge Risk: ⚪ Minimal · up to 80282

This adds design-width normalization and validation to app manifests and reports it in app summaries. No merge-blocking risk was found.

Architecture Summary

Architecture risk: 🔵 Low · up to 80282

The change affects 1 system.

Changed systems: src

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — src (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in src/manifest.mjs: validateApp now adds an error when app.designWidth is NaN, reporting the manifest’s gea.designWidth value.
• observed — Modified behavior in src/manifest.mjs: appSummary now includes the app’s designWidth.
• observed — Modified behavior in src/manifest.mjs: Added normalizeDesignWidth: absent, null, and empty values normalize to 0; finite positive numeric values are retained; other values normalize to NaN.
• observed — Modified behavior in src/manifest.mjs: normalizeApp now sets designWidth by normalizing gea.designWidth.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding the gea.designWidth manifest field.
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.

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[skyturkish]

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