Feat/logs auto follow scroll

[Pnkcaht]

What was happening

The log viewer currently offers two separate modes: auto-follow and manual scroll.

In practice, this causes frequent UX issues:

• When auto-follow is enabled, scrolling up to inspect earlier logs is interrupted as soon as new logs arrive
• Users must manually toggle modes to inspect logs safely
• If auto-follow is left enabled, the view jumps to the bottom and context is lost
• If auto-follow is disabled and forgotten, new log output can go unnoticed

This results in a frustrating experience when inspecting long or fast-updating logs, especially during running pipelines.

Related issue

Closes #5971

What this PR changes

This PR simplifies log following behavior by making it scroll-position aware instead of mode-based.

• Logs automatically follow new output only when the user is already scrolled to the bottom
• As soon as the user scrolls up, auto-follow is disabled
• When the user scrolls back to the bottom, auto-follow resumes automatically
• No manual toggle or mode switching is required

Why this approach

Scroll position is the most reliable signal of user intent.

Previously, auto-follow was controlled by explicit modes, which required constant manual interaction and were easy to forget.
By deriving auto-follow state from the scroll position:

• User intent is respected automatically
• Context is preserved when inspecting older logs
• New output is not missed when returning to the bottom
• The UI becomes simpler and more predictable

Implementation overview

sequenceDiagram
    participant User
    participant UI as Log Viewer
    participant Stream as Log Stream

    Stream->>UI: new log lines
    UI->>UI: check scroll position

    alt user is at bottom
        UI->>UI: autoFollow = true
        UI->>UI: scroll to bottom
    else user scrolled up
        UI->>UI: autoFollow = false
        UI->>UI: preserve scroll position
    end

    User->>UI: scrolls back to bottom
    UI->>UI: autoFollow = true

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Tests

No automated tests were added.