[PM-25654] Add image attachment preview

[amrg101]

🎟️ Tracking

https://community.bitwarden.com/t/view-attachments-without-downloading/52/19

📔 Objective

Viewing image attachments is a hassle since you have to download, save, and open them in another app.
This adds a built-in preview for images, Ideally, we’d have a full file manager that supports all types, but since images are the ones most often needing quick viewing, I think this is okay for now.

The implementation:

• Downloads the file temporarily.
• Loads and displays the image with zoom and pan support.
• Automatically deletes the file once it has been loaded.

📸 Screenshots

Screen_Recording_20250910_170903_Bitwarden.Dev.mp4

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[bitwarden-bot]

Thank you for your contribution! We've added this to our internal tracking system for review.
ID: PM-25654
Link: https://bitwarden.atlassian.net/browse/PM-25654

Details on our contribution process can be found here: https://contributing.bitwarden.com/contributing/pull-requests/community-pr-process.

[SaintPatrck]

Hi @amrg101!

Thank you for submitting this awesome new feature. I've passed it along to the appropriate teams for product review. We'll provide status updates as they become available.

[speedy1804]

wow this looks great, would love to see that on iOS too