fix: preserve original HEIC/HEIF files and treat them as file type

[bang9]

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Description Of Changes

• Fixed side-effect of fix: use mimeType for the expo image picker response #282 and fix: add HEIC/HEIF MIME type support in normalizeFile #280

HEIC/HEIF files are not universally supported across platforms, so UIKit has been treating them as regular files for product compatibility.

Previously, there were cases where HEIC/HEIF files did not have their MIME type properly set. In these cases, getFileType function would fall back to checking the file extension and correctly classify them as file. (Unintentionally working correctly due to a bug)

After recent changes that fixed the MIME type detection, HEIC/HEIF files now have proper MIME types like image/heic. This caused getFileType to classify them as image based on the MIME type prefix. (Fixing one bug exposed another issue)

Solution

Add explicit handling for HEIC/HEIF in getFileType to treat them as file type instead of image.

Side Effects

This change has no negative side effects. The following behaviors are all intentional:

1. Download: HEIC/HEIF files will be saved to the downloads directory instead of images directory
2. File Viewer: HEIC/HEIF files will open via system handler instead of the image viewer
3. Message UI: HEIC/HEIF messages will display as File Message instead of Image Message
4. Channel Preview: Last message will show as "File" instead of "Photo"

Types Of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply_

• Bugfix
• New feature
• Documentation (correction or otherwise)
• Cosmetics (whitespace, appearance (ex) Prettier)
• Build configuration
• Improvement (refactor code)
• Test

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 10.88%. Comparing base (67bec6d) to head (3b754a5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
+ Coverage   10.85%   10.88%   +0.02%     
==========================================
  Files         360      360              
  Lines        9050     9053       +3     
  Branches     2437     2575     +138     
==========================================
+ Hits          982      985       +3     
+ Misses       8067     7992      -75     
- Partials        1       76      +75     

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[OnestarLee]

lgtm! 바로 머지할꼐요