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The single global "Save endpoints" button sat far below the fold and the per-card "Test endpoint" button probed the server-stored settings, so it ignored unsaved form edits. Replace each endpoint card's "Test endpoint" button with a combined "Save and test" button that persists the whole form first and only runs the card's connection probe on a successful save; the global "Save endpoints" button is kept for save-only. - Add handleSaveAndTest: save (rethrows on failure) then probe; skip the test if the save fails (the mutation already surfaces the error). - Add savingTestCapability state so only the clicked card spins during the shared save while all save controls stay disabled (no concurrent saves). - Reset the previous probe result when a new save+test starts. - Add the "Save and test" en-US translation key. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>