Fix history resume playback when video streaming account differs from history account

[Copilot]

When video streaming account (AccountType.video) differs from history recording account (AccountType.heartbeat), clicking history items used the wrong account's progress. Server's lastPlayTime comes from video account, but UI shows history account's progress.

Changes

• Pass explicit progress parameter when navigating from history items to video pages (UGC, PGC, Cheese)
• Handle fully watched videos by converting progress -1 to 0 to restart from beginning
• Add helper methods _getProgressString() and _getProgressInt() to normalize progress conversion

Implementation

// Before: No progress passed, used server's lastPlayTime from video account
PageUtils.toVideoPage(aid: aid, bvid: bvid, cid: cid);

// After: Explicit progress from history account, -1 → 0 for fully watched
PageUtils.toVideoPage(
  aid: aid, 
  bvid: bvid, 
  cid: cid,
  progress: _getProgressInt(item.progress),  // -1 becomes 0
);

Video controller already prioritizes args['progress'] over data.lastPlayTime, so explicit parameter ensures correct playback position regardless of account mismatch.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>fix</issue_title>
<issue_description>视频取流mid与记录历史mid不同时，
请使得使得视频取流账号与记录历史账号不同时，历史记录从断点续播的功能正常工作，从历史记录进入的已看完视频要从头开始播放

我记得backup/pre-cleanup似乎有一些修复，请尽量参照着实现，没有就自己整</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes fix #240

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