feat: Add Image Generator page with model and size selection

[ibehren1]

Add Image Generator Page

Summary

Adds a dedicated Image Generator page for text-to-image generation using Amazon Bedrock image models.

Changes

New Features

• Image Generator Page (/image-generator) - New standalone page for generating images from text prompts

  • Text prompt and negative prompt inputs
  • Model selection dropdown (filtered by AWS region)
  • Image size dropdown with pixel dimensions:
    • 1024×1024, 512×512 (1:1)
    • 1024×576, 1280×720 (16:9)
    • 576×1024, 720×1280 (9:16)
    • 1024×768 (4:3), 768×1024 (3:4)
    • 1152×768 (3:2), 768×1152 (2:3)
  • Output format selection (PNG, JPEG, WebP)
  • Image history with recent generations
  • Keyboard shortcut (⌘+Enter) to generate

• Settings Integration - Added Image Generation section to Settings page for configuring default model

Model Updates

• Updated IMAGE_GENERATION_MODELS to include only models with TEXT input and IMAGE output modalities:
  • Amazon: Nova Canvas, Titan Image Generator v1, Titan Image Generator v2
  • Stability AI: Stable Diffusion 3.5 Large, Stable Image Core, Stable Image Ultra

Files Changed

• src/renderer/src/pages/ImageGeneratorPage/ImageGeneratorPage.tsx (new)
• src/renderer/src/pages/SettingPage/components/sections/ImageGenerationSection.tsx (new)
• src/renderer/src/i18n/locales/imageGenerator/index.ts (new)
• src/common/models/models.ts (updated)
• src/renderer/src/routes.tsx (updated)
• src/renderer/src/pages/SettingPage/SettingPage.tsx (updated)

Testing

• TypeScript compilation passes
• All unit tests pass (261 tests)
• Mac build successful