Fix upload button rendering on top of text in comment input

[Copilot]

The cloud-upload button in the comment input was absolutely positioned over the textarea, causing it to overlap user-entered text. The previous padding-bottom: 28px workaround only reserved space at the very end of the textarea content, so any wrapped or scrolled lines still rendered behind the button.

Changes

• webviews/editorWebview/index.css, webviews/activityBarView/index.css: drop position: absolute on .textarea-wrapper .comment-upload-button and let it flow as a flex row beneath the textarea (the wrapper is already flex-direction: column). Remove the now-unnecessary padding-bottom: 28px on the textarea.

.textarea-wrapper .comment-upload-button {
    align-self: flex-start;
    margin: 2px 0 4px 4px;
    /* …unchanged styling… */
}

The button now sits below the input anchored to the bottom-left, so it can no longer overlap text. The top-right .title-action (sparkle/generate) remains absolutely positioned and is unaffected.

[Copilot]

Pull request overview

This PR fixes the comment input’s “Upload files” (cloud upload) button overlapping textarea content by removing its absolute positioning and letting it render as a normal flex item beneath the textarea in the existing column flex layout. This eliminates the need for the prior padding-bottom: 28px workaround on the textarea.

Changes:

• Removed padding-bottom: 28px from the comment textarea styles (both webviews).
• Changed .comment-upload-button from position: absolute (bottom-left overlay) to align-self: flex-start with margins so it flows below the textarea.
• Kept the top-right .title-action absolutely positioned (editor webview), relying on existing padding-right to avoid overlap.

Show a summary per file

File	Description
webviews/editorWebview/index.css	Moves the upload button out of the textarea overlay and removes the textarea bottom-padding workaround while preserving the title-action overlay behavior.
webviews/activityBarView/index.css	Applies the same upload button layout change and removes the textarea bottom-padding workaround in the activity bar view.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 0