fix: context picker selected row disappears in short IDE terminals

[nathanhuh]

Summary

When running unic inside an IDE integrated terminal with a shorter visible pane, the context picker selected/highlighted row can appear to disappear. The context list still renders, but the active selection is not visually obvious, making navigation confusing.

A screenshot is available from the original report and can be attached to this issue if needed.

Observed behavior

• Open unic in an IDE terminal pane.
• Navigate to the context picker.
• The context table renders, but the highlighted/selected element is not visible or is clipped/too low contrast.
• The footer help bar remains visible.

Suspected cause

The context picker size is derived from Bubbletea terminal dimensions, not a hardcoded screen size, but the current calculations appear too optimistic for short terminal panes:

• internal/app/context_table.go
  • contextTableHeight(terminalHeight) = max(terminalHeight-10, 3)
  • table still reserves at least 3 rows plus panel/header/footer chrome
• internal/app/styles.go
  • fitToHeight() truncates overflowing views from the middle to keep top and footer visible
• internal/app/context_table.go
  • selected row style uses foreground color 170 on background 236, which may have poor contrast in some IDE terminal themes

Desired behavior

• The currently selected context row should remain visible in short IDE terminal panes.
• The selected row should be visually obvious across common terminal themes.
• The help bar should remain visible without clipping the active table selection.

Acceptance criteria

• Reproduce with a short terminal height similar to an IDE integrated terminal.
• Adjust context picker/table height calculation so the rendered view fits without hiding the selected row.
• Ensure selected row styling remains high contrast in dark IDE terminals.
• Add or update tests around compact context picker height/rendering.
• Verify make test and make build pass.

References

• internal/app/context_table.go
• internal/app/styles.go
• internal/app/screen_context.go

[nathanhuh]

@Unic-bot: assign me

[github-actions]

@nathanhuh has been assigned to this issue.