Blocknote editor fix

[guillim]

After reading the blocknote documentation :

• we decided to increase to 100% the lines width
• we decided to reduce as much as possible inner padding
• we decided it's on the parent to decide the padding of the richtext
  The two last points are recommended in a discussion on the project blocknote. This way clicking on padding won't trigger weird behaviour on Chrome.

Fixes twentyhq/core-team-issues#827 (comment)

[github-actions]

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[greptile-apps]

PR Summary

This PR implements styling adjustments for the BlockNote editor integration, focusing on padding control and width management to prevent Chrome-specific click behavior issues.

• Removed inner padding (44px) from BlockEditor.tsx and delegated padding control to parent components
• Added box-sizing: border-box to containers in ShowPageActivityContainer.tsx and CommandMenuEditRichTextPage.tsx for consistent sizing
• Set width: 100% in BlockEditor.tsx inline content for full-width lines
• Adjusted RichTextFieldInput.tsx container with left padding (theme.spacing(12)) and negative margin adjustments
• Modified container positioning in affected components to ensure proper Chrome click behavior

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[etiennejouan]

LGTM 👏 👏 👏
(seen together position:relative to remove)