the modern chat input composer layout to better handle vertical
space and alignment. Change the row crossAxisAlignment from
center to end so controls align to the input bottom. Wrap the animated
container with a ConstrainedBox that limits the composer max height to
25% of the screen, preventing excessive growth on tall displays.
Reorder and clean up the AnimatedContainer/decoration block, extracting
the composer radius constant and preserving styling (background color,
border color/width). Move the text field and inline mic into the same
row structure under the constrained container and retain the isActive
flag and padding. These changes prevent layout overflow, ensure a
consistent border radius, and improve visual alignment of controls.
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