[web][photos] Adding support for downloading files as zip

[AswinAsok]

Description

Albums now are being downloaded as a group of zip files, unless it's a single file.

[socket-security]

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👍 No dependency changes detected in pull request

[chatgpt-codex-connector]

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[anandbaburajan]

• Lint is failing
• Current naming is: Himalayas On Cycle - 1K KM to Leh (17 files)-4. Let's do Himalayas On Cycle - 1K KM to Leh (Part 4 - 17 files) and the first one should have "Part 1" as well
• I tried download two albums, and in both of them, a few files failed. I clicked the retry button in both of them and the failed files in both of them successfully downloaded. Which makes me curious, why were the files failing at all? I briefly checked those few files, and didn't find anything weird about them. Note that the two albums were large (200+ photos)
• I tried one of those albums again and didn't get any failed files :D
• When clicking download on an album, the notification/toast says "Downloading ... 34/232 files" but since nothing is being downloaded until the zip is ready, it might be confusing. We could say "Processing" maybe? Not sure