Add GitHub Action to sync design standards and design-audit skill

[Copilot]

• Add sync_design_standards.yml workflow to mirror design standards from meshtastic/design
• Add .skills/design-audit/SKILL.md agentic skill for auditing Swift/SwiftUI code against design standards
• Fix review feedback: correct default path, clarify theme constants
• Update SKILL.md to reference .standards/meshtastic_design_standards_latest.md per reviewer request
• Replace design instructions in .github/copilot-instructions.md with new expert developer text
• Update workflow to output _latest.md filename for consistency
• Fix missing leading dot in copilot-instructions.md path
• Run validation

[garthvh]

@copilot

I need to create a .skills/design-audit/SKILL.md file for the Meshtastic Apple repository in this pull request. The goal is to create a specialized agentic skill that audits the Swift/SwiftUI code against our official design standards.

Requirements:

Context: Direct the AI to reference the local file .standards/meshtastic_design_standards_latest.md as the source of truth.

Persona: The skill should act as a 'Strict Meshtastic UI Reviewer' who values information density, outdoor legibility, and consistent spacing.

Logic:

Check for 'Magic Numbers' (hardcoded dp/sp values) and suggest using the theme's Padding or Typography constants.

Ensure color usage matches the Meshtastic palette (especially for dark/OLED mode efficiency).

Validate that touch targets for icons and buttons are at least 48dp.

Output Format: The audit must be returned as a Markdown table with columns: Feature, Status (✅/⚠️/❌), and Fix Suggestion.

Command: Define a command /audit-ui that triggers this behavior."

[Copilot]

@copilot

I need to create a .skills/design-audit/SKILL.md file for the Meshtastic Apple repository in this pull request. The goal is to create a specialized agentic skill that audits the Swift/Swi...

Created .skills/design-audit/SKILL.md in commit 2dae6f3. It defines the /audit-ui command with the persona, context reference to .standards/meshtastic_design_standards.md, all five check categories (magic numbers, color palette, 48dp touch targets, SF Symbols, typography), and the markdown-table output format you described.