[Feature]: Edit attribute values  #82

What type of issue is this?

• Bug report
• Feature request

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of the reqifviewer
• I have searched open and closed issues to ensure it has not already been reported

Description

Acceptance criteria

• Inline editors per datatype: string (respecting MaxLength), rich text (Blueprint rich text editor producing the XHTML subset ReqIF allows), integer and real (min, max, accuracy), boolean, date, enumeration (single or multiple values).
• Respects IsEditable and the editable attributes of the specification hierarchy; read-only values are shown as such.
• Validation messages appear next to the field; invalid values cannot be exported.

Steps to Reproduce

NA

System Configuration

• reqifviewer version: 6.1.0 (development, with [Refactor] Blazor Blueprint app shell and Blazor Web App hosting #56)
• Environment (Operating system, version and so on): Windows 11, Chrome
• .NET Framework version: .NET 10
• Additional information: Plan item E-04 of the viewer improvement plan. Size: L. Depends on: [Feature]: Edit session with change tracking and undo  #81, [Feature]: Requirement details panel  #70.