fix: toolbar items missing from overflow menu when window is narrow

[datlechin]

Summary

• When the window width is too small, all right-side toolbar buttons collapsed into a >> overflow chevron that only showed 1 item (Filters), with all other buttons missing
• Root cause: all buttons were packed into a single ToolbarItem with an HStack, so macOS treated them as one atomic unit that couldn't be split in the overflow menu
• Fix: replace ToolbarItem + HStack with ToolbarItemGroup where each button is a separate child item, and use Label instead of bare Image so overflow menu items show readable text
• Applied to both left (navigation) and right (primaryAction) toolbar sections

Test plan

• Verify toolbar looks the same at normal window widths (icons only, proper spacing)
• Resize window narrower — verify individual buttons appear in the >> overflow menu with text labels
• Verify all buttons remain functional (filters, history, export, import, inspector, connection switcher, database switcher, refresh, preview)
• Verify popovers (connection switcher, SQL preview) still work correctly

[chatgpt-codex-connector]

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