Style CLI login callback pages to match the console theme

[jhivandb]

Purpose

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• [Bug]: CLI login success page is not styled #1503

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• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes/no
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Summary by CodeRabbit

• User Experience Improvements
  • Added responsive success and error pages for the sign-in flow.
  • Added light and dark theme support with clear status icons.
  • Improved handling and display of authorization error messages.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: f0e26d61-afae-4a95-b15a-db8b3ea95a38

📥 Commits

Reviewing files that changed from the base of the PR and between 045dd22 and 28afc06.

📒 Files selected for processing (2)

• cli/pkg/auth/login_page.go
• cli/pkg/auth/pkce.go

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📝 Walkthrough

Walkthrough

The change adds a shared themed login page with escaped messages and responsive light/dark styling. The PKCE callback handler uses the page helpers for success and error responses while preserving existing status codes and callback errors.

Changes

Login page rendering

Layer / File(s)	Summary
Shared login page template cli/pkg/auth/login_page.go	Adds responsive success and error page markup, status icons, light/dark styles, rendering helpers, and HTML-escaped messages.
PKCE callback integration cli/pkg/auth/pkce.go	Sets the HTML content type and routes state mismatches, authorization errors, missing codes, and successful callbacks through the shared renderers. Removes the inline templates and unused import.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant CallbackHandler
  participant LoginPageRenderer
  participant Browser
  CallbackHandler->>LoginPageRenderer: render success or error page
  LoginPageRenderer-->>CallbackHandler: return themed HTML
  CallbackHandler->>Browser: write HTML response

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🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description includes the purpose and issue reference, but most required sections contain only template instructions and no project-specific details.	Complete the required sections with the goals, approach, UI evidence, testing, security checks, documentation impact, release note, and other applicable details.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: updating CLI login callback pages to match the console theme.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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