feat: unify row viewer and column explorer

[kirangadhave]

📝 Summary

Combines the row viewer and column explorer in a single tabbed "Tab Explorer Pane"

🔍 Description of Changes

• Single tabbed panel with Rows and Columns tabs, replacing two independent panels
  • Single toolbar button toggles the panel open/close; tab selection lives inside the panel
  • When only one tab is available (e.g. mo.ui.dataframe which has showColumnExplorer=false), renders without a tab bar
  • Tab type persists when toggling the panel on/off
• Minor UI improvements on side bar
  • row viewer search textbox is visually consistent with column explorer search
  • "select/deselect row" text is replaced with a checkbox
  • Better formatting for top bar (pin, focus, close btn)

Screen.Recording.2026-03-27.at.3.03.05.PM.mov

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Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Mar 27, 2026 10:07pm