feat: add Android dialog mode for external downloads

[Locon213]

Closes #1357

Summary

• Add a lightweight Android dialog activity for external download launches instead of opening the full main UI.
• Route Android external links, shared URLs/files, magnets, torrents, and download intents into the quick create flow when launched in dialog mode.
• Add a compact create dialog that shows the resolved file name, download path selector, and confirm/cancel actions.
• Create the download task in the background and close the dialog after confirmation so the user can stay in the original app or browser.

Screenshot

Testing

• Launched on an Android device

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.63%. Comparing base (def54f8) to head (272adc6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1362      +/-   ##
==========================================
+ Coverage   68.59%   68.63%   +0.04%     
==========================================
  Files          60       60              
  Lines        9177     9177              
==========================================
+ Hits         6295     6299       +4     
+ Misses       2184     2182       -2     
+ Partials      698      696       -2     

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[monkeyWie]

Thanks bro!