fix: view variant hugs content with max-height cap + inner scroll

- bottom: auto so box height follows content
- max-height caps at full panel height so it never overflows
- contentBar overflow-y:auto handles scrolling when content is long

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 02919104-34f1-44e8-91db-7bfd688b1b6e

Author: Devyani Jain

components.css

@@ -544,6 +544,8 @@
 }
 
 #viewVariant {
+  bottom:     auto;           /* hug content height */
+  max-height: calc(100% - var(--padding-md) * 2); /* cap at full panel */
 }
 
 /* ── Action Bar ── */