feat: implement Actions Gallery with character integration and triple LoRA chaining

- Added Actions gallery with CRUD and JSON sync
- Implemented Triple LoRA workflow (Character -> Outfit -> Action)
- Added character-integrated previews for Actions with style matching
- Implemented granular prompt selection and default persistence for Actions
- Added detailed development guide for extending gallery features

DEVELOPMENT_GUIDE.md

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+# Feature Development Guide: Gallery Pages & Character Integration
+
+This guide outlines the architectural patterns and best practices developed during the implementation of the **Actions** and **Outfits** galleries. Use this as a blueprint for adding similar features (e.g., "Scenes", "Props", "Effects").
+
+## 1. Data Model & Persistence
+- **Database Model:** Add a new class in `models.py`. Include `default_fields` (JSON) to support persistent prompt selections.
+- **JSON Sync:** Implement a `sync_[feature]()` function in `app.py` to keep the SQLite database in sync with the `data/[feature]/*.json` files.
+- **Slugs:** Use URL-safe slugs generated from the ID for clean routing.
+
+## 2. Triple LoRA Chaining
+Our workflow supports chaining three distinct LoRAs from specific directories:
+1.  **Character:** `Illustrious/Looks/` (Node 16)
+2.  **Outfit:** `Illustrious/Clothing/` (Node 17)
+3.  **Action/Feature:** `Illustrious/Poses/` (Node 18)
+
+**Implementation Detail:**
+In `_prepare_workflow`, LoRAs must be chained sequentially. If a previous LoRA is missing, the next one must "reach back" to the Checkpoint (Node 4) or the last valid node in the chain to maintain the model/CLIP connection.
+
+## 3. Adetailer Routing
+To improve generation quality, route specific JSON sub-fields to targeted Adetailers:
+- **Face Detailer (Node 14):** Receives `character_name`, `expression`, and action-specific `head`/`eyes` tags.
+- **Hand Detailer (Node 15):** Receives priority hand tags (Wardrobe Gloves > Wardrobe Hands > Identity Hands) and action-specific `arms`/`hands` tags.
+
+## 4. character-Integrated Previews
+The "Killer Feature" is previewing a standalone item (like an Action or Outfit) on a specific character.
+
+**Logic Flow:**
+1.  **Merge Data:** Copy `character.data`.
+2.  **Override/Merge:** Replace character `defaults` with feature-specific tags (e.g., Action pose overrides Character pose).
+3.  **Context Injection:** Append character-specific styles (e.g., `[primary_color] simple background`) to the main prompt.
+4.  **Auto-Selection:** When a character is selected, ensure their `identity` and `wardrobe` fields are automatically included in the prompt, even if the feature page has its own manual checkboxes.
+
+## 5. UI/UX Patterns
+- **Selection Boxes:** Use checkboxes next to field labels to allow users to toggle specific tags.
+- **Default Selection:** Implement a "Save as Default Selection" button that persists the current checkbox state to the database.
+- **Session State:** Store the last selected character and field preferences in the Flask `session` to provide a seamless experience when navigating between items.
+- **AJAX Generation:** Use the WebSocket + Polling hybrid pattern in the frontend to show real-time progress bars without page reloads.
+
+## 6. Directory Isolation
+Always isolate LoRAs by purpose to prevent dropdown clutter:
+- `get_available_loras()` -> Characters
+- `get_available_clothing_loras()` -> Outfits
+- `get_available_action_loras()` -> Actions/Poses