Seven months into the war in Gaza, Mohammed Said al-Halimy began documenting his daily routine in earnest. Mr. al-Halimy, known by his friends and online as Medo, already had a teenager’s knack for capturing sunsets , songs and life’s milestones in short video snippets. That life was fractured after Israeli bombs fell on Gaza in response to the Hamas-led Oct. 7, 2023, attack, destroying his university and forcing him into a makeshift beach campsite. As months of fighting ground into the summer,