What is meant by "al-jazaʿ" (impatience/distress) and "as-sakhaṭ" (displeasure/anger) in the Hadith: "Whoever is pleased, for him is pleasure; and whoever is displeased, for him is displeasure; and whoever is distressed, for him is distress"? And what are the practical manifestations of displeasure, and how does this reconcile with Allah's love for the displeased person?

The intended meaning of "discontent" here is Allah Almighty's discontent and wrath upon His servant. There is no text that specifies a punishment for one who is discontent with destiny. The reconciliation between Allah's discontent and His love is that tribulation is a tradition. So, whoever perseveres will attain Allah's pleasure for their success, and whoever is discontent with Allah's decree will incur Allah's wrath for their failure.