ENG-8355: Make prompt box textarea required

[carlosabadia]

No description provided.

[linear]

ENG-8355 Update textarea required in web

[greptile-apps]

Greptile Summary

• Added client-side validation to the prompt textarea with required=True and min_length=5 attributes
• Improves user experience by providing immediate feedback before form submission

Confidence Score: 5/5

• This PR is safe to merge with no identified risks
• The change adds defensive client-side validation that complements existing server-side validation, follows browser-native HTML5 form validation patterns, and requires minimal code change with no breaking functionality
• No files require special attention

Important Files Changed

Filename	Overview
pcweb/pages/landing/views/hero.py	Added client-side validation (required=True, min_length=5) to textarea, which complements existing server-side validation

Sequence Diagram

sequenceDiagram
    participant User
    participant Browser
    participant Form
    participant SubmitPromptState
    participant Backend
    
    User->>Form: "Enter prompt text"
    User->>Form: "Click Build Your App"
    Form->>Browser: "Validate required and min_length=5"
    alt "Validation fails"
        Browser->>User: "Show browser validation error"
    else "Validation passes"
        Browser->>SubmitPromptState: "Submit form with prompt"
        SubmitPromptState->>SubmitPromptState: "Check prompt length >= 5"
        alt "Server validation fails"
            SubmitPromptState->>User: "Show toast warning"
        else "Server validation passes"
            SubmitPromptState->>Backend: "POST /prompt with prompt and images"
            Backend->>SubmitPromptState: "Response"
            SubmitPromptState->>User: "Redirect to AI builder"
        end
    end

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[greptile-apps]

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