Fix provider state refresh and taskbar-safe window placement for menu/settings popups

[isbool]

• With no enabled providers, UI messaging was misleading.
• Refresh could run before new settings were synced, causing stale refresh behavior.
• Main popup could open oversized/cropped or in awkward screen positions.
• Settings window could appear behind/away from the menu instead of opening near it.

Showcase of the issues:

What changed

• Added provider placeholder helper and synchronized provider list on refresh startup.
• Added explicit empty/fallback UI states:
  • No providers selected.
  • No provider data available.
• Reordered settings/refresh flow so settings are synced before refresh is triggered.
• Main popup:
  • Taskbar-safe work-area sizing/positioning.
  • Compact default size (360x500) with monitor clamping.
  • Explicit open/reposition behavior for tray and shortcut paths.
• Settings window:
  • Positioned adjacent to the main popup (right/left/top/bottom) based on available space.
  • Uses taskbar-safe work area and monitor clamping.
  • Focuses when spawned with new placement.
• Reverted temporary auth UX experiment (Authenticate...) per request.

Showcase after the changes

:

[Finesssee]

yooo thanks for the first pull request on this project man!

[Finesssee]

I'll merge this PR

[Finesssee]

Thanks for the first PR to this repo, @isbool! Great work on the window placement fixes and provider state sync — the before/after GIFs really showed the improvement. Merged!

[isbool]

@Finesssee thanks for merging! 😄

I’m working on another PR and wanted to ask: should we enforce cargo fmt (rustfmt) in the repo? It’d keep formatting consistent across machines and avoid big style diffs. I ran it once and it touched a lot of unrelated code, so I had to revert most of it to match the current formatting. Happy to follow whatever you prefer.