feat: Add track last position toggle and clear history option

[Copilot]

Adds granular control over playback position tracking to address users who prefer manual seeking over resume prompts.

Changes

Settings Service

• Added TrackLastPosition boolean setting (default: true)
• Stored as "General/TrackLastPosition" in local settings

Position Tracking Logic

• SeekBarViewModel.UpdateLastPosition() now checks TrackLastPosition before saving
• SeekBarViewModel.RestoreLastPosition() early-returns when tracking disabled
• When disabled: no positions saved, no resume prompts or auto-resume

UI Structure

Track last position (expander)
├── Always resume from last position (toggle)
└── Clear tracked position history (button)

The existing "Always resume from last position" setting is now a sub-option under the new expander, creating a logical hierarchy where the parent controls tracking and the child controls auto-resume behavior.

Data Management

• Added LastPositionTracker.ClearAll() to wipe all tracked positions
• SettingsPageViewModel.ClearLastPositionHistoryAsync() clears and persists immediately

Behavior

Track Enabled	Auto-Resume	Result
Off	N/A	No tracking, no prompts
On	Off	Tracks + shows resume prompt
On	On	Tracks + auto-resumes

Disabling tracking prevents both saving new positions and using existing ones, effectively silencing all resume functionality without deleting saved data.

Warning

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• crl.godaddy.com
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• ocsp.godaddy.com
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If you need me to access, download, or install something from one of these locations, you can either:

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Option to disabled "Resume where you left off" prompt</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
I am personally not a fan of the prompt to "Resume where you left off" and often prefer to just manually make use of the timeline/SeekBar.

Describe the solution you'd like
Having a sub option to toggle Track last position and a sub option to Clear tracked/last position history below Always resume from last position would be pretty fancy.

Describe alternatives you've considered
N/A

Additional context
I understand this is a pedantic request; but, I wanted to throw the idea out there. I assume that not having the playback progress stored would result in the player acting like it does when a video is played for the first time, or is restarted after ending at 0:00 playback progress, thus effectively disabling the prompt.</issue_description>

<agent_instructions>Implement a "Track last position" toggle and a "Clear tracked position history" option.</agent_instructions>

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

• Fixes Option to disabled "Resume where you left off" prompt #771

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[United600]

#700 is same idea, right?

[huynhsontung]

@United600 Oh my bad you are right. I didn't expect this to be in a privacy-related PR. Is there any blocker on #700?

[United600]

@United600 Oh my bad you are right. I didn't expect this to be in a privacy-related PR. Is there any blocker on #700?

The position list was highly unreliable, making testing painful. The main issue is clearing the cache, for some reason, it persists and (on app exit) regenerates the list after being cleared.