feat: add filename and dimensions to image paste placeholders

[afc163]

图片占位符从 [Image #1] 改为 [Image 100X100 filename#1] 格式，综合参考了 codex 和 gemini。

对于长文件名作了中间的省略处理。

[Copilot]

Pull Request Overview

This PR enhances image paste placeholders from the simple [Image #1] format to a more informative [Image 100X100 filename#1] format that includes dimensions and filename information. The change improves user experience by providing more context about pasted images.

• Added image dimension extraction from binary headers for PNG, JPEG, GIF, and WebP formats
• Implemented filename truncation with middle ellipsis for long filenames
• Updated placeholder format to include dimensions and filename across all relevant components

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/ui/useImagePasteManager.ts	Core implementation of dimension extraction, filename truncation, and new placeholder format
src/ui/useInputHandlers.ts	Updated to pass filename parameter to image paste handler
src/ui/store.ts	Modified regex pattern to match new placeholder format and extract image IDs
src/ui/TextInput/utils/imagePaste.ts	Enhanced to return filename along with image data
src/ui/TextInput/index.tsx	Updated to pass filename to onImagePaste callback
src/ui/TextInput/hooks/useTextInput.ts	Added filename parameter to onImagePaste type signature

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Pull Request Overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}