Update UX for text area (#1953)

* update ux for text area

* fix z-index

* fix tests

* Update .changeset/bright-trains-crash.md

Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>

* extract off drop method per code review bot

* address bot comment

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Co-authored-by: ellipsis-dev[bot] <65095814+ellipsis-dev[bot]@users.noreply.github.com>

Author: chadgauth

.changeset/bright-trains-crash.md

@@ -0,0 +1,10 @@
+---
+"roo-cline": minor
+---
+
+UX fixes that:
+
+- Allow dropdowns to be controlled when text box is disabled
+- Separates and clarifies buttons and dropdowns from inputs
+- Adds a secondary placeholder for easier visibility of mode controls
+- Updates to tailwind standard