Automatically set Max Length is too short for extracted Subject

[GuzelyaN]

.eml file 注文済み_ 「Amazonベーシック USB ケーブル USB2.0...」.eml

Severity: Medium

Environment:
OS: Windows 11
Browser: Firefox 144.0.2
Screen resolution: 1024x1366
Device: Windows laptop

Steps to reproduce:

1. Open https://registry.zk.email/
2. Click the "Create Blueprint" button
3. In the modal window "Submit Blueprint", click to upload a .eml file
4. Select and open the file
5. Click Next
6. Select "Subject" in the "Quick header extraction"
7. Check the output

Expected result:
1.Max Length automatically fits the length of extracted result
2. The output field idisplays the extracted value successfully

Actual result:
No output is displayed: neither a length related error nor a successfull extraction result appears

If Max Length is increased, the result dispays correctly

[coderabbitai]

A summary of the changes CodeRabbit can apply:

• Update src/app/create/[id]/createBlueprintSteps/ExtractFields.tsx to increase maxLength for Subject from 64 to 256, Receiver from 64 to 128, Sender name from 64 to 128 (leave Sender domain and Timestamp at 64) and add docs/bugfixes/maxlength-quick-header-extraction.md explaining the fix.

• Update Quick Header Extraction defaults to avoid truncated/failed extractions by modifying src/app/create/[id]/createBlueprintSteps/ExtractFields.tsx to change Subject maxLength 64→256, Receiver 64→128, Sender name 64→128, and add a new docs/bugfixes/maxlength-quick-header-extraction.md documenting the issue, root cause, changes, tests, and impact.

• ✅ Create PR with these edits
• 📋 Get copyable edits

[GuzelyaN]

Staging

[GuzelyaN]

Issue still reproducible.