Peek: Add setting to disable file metadata tooltip

[Copilot]

Adds a "Show file preview tooltip" toggle to Peek's Behavior settings, letting users disable the metadata tooltip (filename, type, date modified, size) shown on hover over the preview.

Changes

• PeekProperties — new ShowFilePreviewTooltip: BoolProperty (default true)
• IUserSettings / UserSettings — expose the setting; updated by the existing file watcher on settings change
• FilePreview — new ShowFilePreviewTooltip DependencyProperty; sets InfoTooltip = null when disabled (WinUI suppresses tooltip on null content); re-triggers UpdateTooltipAsync when re-enabled with a file loaded; infoTooltip field changed to string?
• MainWindow.xaml.cs — reads setting from IUserSettings and pushes it to FilePreviewer.ShowFilePreviewTooltip on each Initialize() call, picking up the latest user preference each time Peek activates
• PeekViewModel — ShowFilePreviewTooltip property for two-way Settings UI binding
• PeekPage.xaml — toggle in the Behavior group, consistent with existing toggles
• Resources.resw — localizable strings for header and description

PR Checklist

• Closes: #xxx
• Communication: I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end-user-facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Setting defaults to true — no behavior change for existing users. The tooltip suppression works by setting InfoTooltip to null; WinUI's ToolTip does not open when Content is null, so no empty popup appears. The custom tooltip placement logic (top/bottom based on cursor Y) is unaffected.

Validation Steps Performed

• Verified toggle appears in Peek Settings > Behavior
• Toggling off suppresses the hover tooltip on image, video, and audio previews
• Toggling back on restores tooltip with file metadata on next file load
• Default true preserves existing behavior

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