fix(android): preserve encoded content URIs

[ngocdevv]

Summary

• Preserve Android content:// source URIs exactly as received.
• Continue decoding file:// and other local paths, retaining support for encoded spaces and accented filenames.

Problem

Android scoped URI permissions are keyed by the exact URI. The current local-source path runs every URI through decodeURIComponent, so a granted URI such as:

content://com.android.providers.downloads.documents/document/msf%3A6179

becomes .../msf:6179 before it reaches ContentResolver. That no longer matches the temporary permission granted by Android.

Fix

Detect content:// sources before normalizing the local path and pass those URIs through unchanged. All non-content local sources keep the existing decoding behavior, including the accented-filename fix from #873.

Testing

• Focused Jest regression check against Pdf#_prepareFile:
  • content://.../msf%3A6179 remains byte-for-byte unchanged.
  • file:///documents/R%C3%A9sum%C3%A9%20final.pdf still becomes /documents/Résumé final.pdf.
• node --check index.js
• git diff --check
• npm pack --dry-run --ignore-scripts

Closes #990.