Enable hosting banner

[Alek99]

This PR enables the hosting banner by default and adds it to the navbar component so it displays on all pages.

Changes:

• Set show_banner default value to True in HostingBannerState
• Added hosting_banner() component to the navbar so it renders at the top of all pages

[greptile-apps]

Greptile Overview

Greptile Summary

This PR enables the hosting banner by default and integrates it into the navbar component for site-wide visibility.

• Sets show_banner default value to True in HostingBannerState, ensuring the on-premises deployment blog banner appears immediately on page load
• Adds hosting_banner() component directly into the navbar, placing it above the header and ensuring consistent display across all pages
• The banner remains user-dismissible via the X icon, which sets force_hide_banner to prevent future display during the session

Confidence Score: 5/5

• This PR is safe to merge - simple default value change and component addition with no risk of breaking functionality.
• The changes are minimal and low-risk: changing a boolean default from False to True and adding an existing component to the navbar. The banner functionality was already implemented and tested in PR Add on-premises deployment blog post and banner #1702. The component placement is correct as it's added inside a memoized navbar that's shared across all page templates.
• No files require special attention.

Important Files Changed

File Analysis

Filename	Score	Overview
pcweb/components/hosting_banner.py	5/5	Changed show_banner default from False to True, enabling the on-premises deployment blog banner by default.
pcweb/components/docpage/navbar/navbar.py	5/5	Added hosting_banner() component inside the navbar to display the banner at the top of all pages.

Sequence Diagram

sequenceDiagram
    participant User
    participant Navbar
    participant HostingBanner
    participant HostingBannerState

    User->>Navbar: Loads any page
    Navbar->>HostingBanner: Renders hosting_banner()
    HostingBanner->>HostingBannerState: on_mount → show_blog_banner()
    HostingBannerState-->>HostingBanner: show_banner = True (already default)
    HostingBanner-->>User: Display banner (if is_banner_visible)
    
    User->>HostingBanner: Click X icon
    HostingBanner->>HostingBannerState: hide_banner()
    HostingBannerState-->>HostingBannerState: force_hide_banner = True
    HostingBannerState-->>HostingBanner: is_banner_visible = False
    HostingBanner-->>User: Banner hidden

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[greptile-apps]

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