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feat(file_storage): public files, anonymous serving, list search/sort, thumbnails #464

Job	Run time
JS build (Vite)	46s
JS lint & format	20s
Python lint & format	15s
Python tests	9m 20s
Perf guards (Playwright)	1m 43s
JS typecheck	41s
Package build (release dry-run)	15s
E2E smoke (Playwright)	2m 15s
File size (300-line cap)	13s
JS tests (Vitest)	42s
Python typecheck	16s
PR checks	2s
	16m 48s