fix: update isCreate logic for pending tasks

[Roxym3]

Problem

The isCreate flag in doStart was ignoring tasks in Wait status. This caused the AutoRename logic to be skipped when a task moved from the queue to the running state, leading to file overwrites.

Solution

• Included base.DownloadStatusWait in the isCreate logic.
• Added task.Progress.Downloaded == 0 check to prevent accidental renames on resumed tasks.

Impact

Fixes #1286.

[monkeyWie]

This condition is still not cautious enough, it is recommended to add an isCreated flag to indicate whether the task has created a file, otherwise the paused task will create a new file if it re-enters the waiting state

[monkeyWie]

LGTM, but just keep downloader.go and model.go commits

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.03%. Comparing base (09f7c88) to head (3ed9e8e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1314      +/-   ##
==========================================
- Coverage   71.05%   71.03%   -0.03%     
==========================================
  Files          49       49              
  Lines        6519     6521       +2     
==========================================
  Hits         4632     4632              
- Misses       1459     1461       +2     
  Partials      428      428              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[monkeyWie]

Thanks!