feat: gaps screen with AI and capsule wardrobe recommendations

[jvsena42]

Summary

Implement the Gaps screen showing wardrobe gap recommendations. When Claude AI is connected, shows personalized suggestions with pairing counts. Without AI, shows curated capsule wardrobe essentials (from Kimdamoda's 11-piece guide) filtered against items the user already owns.

Changes

• GapsScreen (Android & iOS): Card-based UI with banner (AI Recommendations / Common Suggestions), grouped recommendation cards by category, detail bottom sheet, and "Add to Wardrobe" flow that opens AddItemSheet pre-filled
• GapsViewModel (MVI): Loads AI recommendations when API key is configured, falls back to static capsule wardrobe suggestions filtered by owned subcategories
• Enhanced GapRecommendation model: Added subcategory, colors, seasons, fit, material, and mappedCategory fields for the detail sheet
• Updated AI prompt: GAPS_SYSTEM_PROMPT now requests subcategory/fit/material in JSON responses with safe parsing via runCatching
• CapsuleWardrobe.kt: Static list of 13 men's capsule wardrobe essentials (tops, layering, bottoms, shoes, accessories)
• GapRecommendationParsingTest: 6 unit tests covering full/partial/invalid JSON parsing and fallback filtering logic
• AiLockedSheet integration: "Go to Settings" button now navigates to Settings tab from Gaps screen
• INTERNET permission: Added missing permission to AndroidManifest
• Persona.md: Added user persona document for design reference

Test plan

• Open Gaps tab without API key → verify "Common Suggestions" banner and capsule wardrobe items grouped by category
• Tap "Common Suggestions" banner → verify AiLockedSheet appears, "Go to Settings" navigates to Settings tab
• Tap a recommendation card → verify detail sheet with item name, category, pairing info, subcategory/color/season/fit/material rows
• Tap "Add to Wardrobe" in detail sheet → verify AddItemSheet opens pre-filled with recommendation data
• Add some items with subcategories (e.g., jeans) → verify those subcategories are filtered out of Common Suggestions
• Add all capsule items → verify "Your wardrobe looks complete!" empty state
• Connect API key and open Gaps tab → verify "AI Recommendations" green banner and personalized suggestions with pairing counts
• Verify both phone and tablet layouts on Android and iOS

Checklist

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