refactor: extract all inline colors to WornColors

[jvsena42]

Summary

Centralize all inline color definitions into the WornColors theme files on both Android and iOS. This eliminates scattered hex color literals across 13 files and ensures a single source of truth for the design system palette.

Changes

• Added 13 new color tokens to WornColors (Android) and WornColors.swift (iOS): AccentIndigo, AccentCoral, AccentGreenEnd, AccentGreenDark, DeleteRed, SaveGradientStart, SaveGradientEnd, and 6 CategoryDot* colors
• Replaced all inline Color(0xFF...) / Color(hex: "...") usages across 13 component and screen files with WornColors.* references
• Removed duplicate DeleteRed and AccentGreenEnd private vals from WardrobeScreen and OutfitsScreen
• Made Category.iconRes() in AddItemFields internal (was already done in prior branch)
• Clothing color picker palette (Cream, Black, Navy, etc.) intentionally left inline as those are data values, not theme colors

Test plan

• Verify all screens render with correct colors (no visual regressions)
• Check delete buttons are red, CTA gradients are green, outfit badges show indigo/coral/green
• Verify category dots show correct colors per category in clothing cards
• Run ./gradlew :shared:allTests — all tests pass
• Run ./gradlew detekt — clean

Checklist

• ./gradlew detekt passes
• Tested on Android
• Tested on iOS
• Updated documentation (if applicable)

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