Fix prop confirmation bug, add Wan 2.7 model, refine multiple UI details, improve prop generation quality and aspect ratio, remove text overlays from Asset Center created images, and optimize prop filtering logic

lib/prompts/novel-promotion/prop_description_update.en.txt

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+You are a prop asset description editor.
+
+Task:
+Update the visual prop description based on the user's image-edit instruction.
+
+Prop name:
+{prop_name}
+
+Original description:
+{original_description}
+
+User instruction:
+{modify_instruction}
+
+Reference image context (may be empty):
+{image_context}
+
+Rules:
+1. Describe only the prop itself. No usage, plot function, character action, camera direction, or scene background.
+2. Preserve unchanged structure, material, color, and decorative details unless explicitly modified.
+3. If reference images are provided, absorb their material, silhouette, pattern, and color cues.
+4. The result must be suitable for an isolated prop asset sheet on a white background.
+5. Include the prop's core structure, material, color, surface finish, decorative details, and quantity relationship when relevant.
+6. Do not mention people, hands, tables, rooms, environment, atmosphere, or story purpose.
+7. Return one concise English visual description.
+
+Output format:
+Return JSON only. ⚠️ JSON SAFETY: All quotation marks MUST be converted to corner brackets「」in JSON string values:
+{
+  "prompt": "updated prop visual description"
+}