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Align "Show more lines" placement across Standard and ASB modes #20455

@jwhelangoog

Description

@jwhelangoog

What would you like to be added?

Depending on the current mode, the Ctrl+O hint to expand more lines can appear at different locations within the UI.

  • In ASB mode, the hint appear directly below the overflowing content element
  • In Standard mode, the hint is centralized to appear within the ToastDisplay within the Composer element whenever overflowing elements exist within the last turn of responses

Converge these two experiences on the Standard mode behavior showing the hint in the Composer when any overflowing elements exists in the last response that can be expanded. This change should prevent the hint from potentially appearing multiple times w/in the ASB history.

Why is this needed?

The current inconsistency in displaying the Ctrl+O ("Show more lines") hint depending on the UI mode can confuse users and clutter the UI, especially in ASB mode where multiple hints may appear. Aligning behaviors provides a cleaner, more intuitive, and less distracting experience. It also streamlines discoverability for the expand control regardless of mode.

Additional context

Related to PR #19010 changes

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area/coreIssues related to User Interface, OS Support, Core Functionalitystatus/need-triageIssues that need to be triaged by the triage automation.
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