602b7568

By: Michael Lynch <git@mtlynch.io>

Use lowercase entry type values for photo and video

Switches EntryTypePhoto and EntryTypeVideo from "PHOTO"/"VIDEO" to
"photo"/"video". Updates all call sites:

- handlers/store.go: MediaEntry.Type changed from string to
  littlemoments.EntryType so comparisons use the constants directly
- handlers/browse.go and handlers/media.go: compare against
  littlemoments.EntryTypeVideo instead of a string literal
- store/memory/memory.go: drop now-unnecessary string cast
- tinybeans/convert.go: add littleMomentsEntryType() to explicitly map
  Tinybeans PHOTO/VIDEO values to the littlemoments constants

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
configuredevShellbackendbackend-devcheck-bashcheck-frontendcheck-go-formattingcheck-go-test-packagescheck-trailing-newlinecheck-trailing-whitespacediagramdocker-imagee2e-testsgo-testsimport-from-tinybeanslint-sqllittle-momentslittle-moments-devx86_64-linux