fix(desktop): correct Windows tray icon theme and DPI rendering

[AbirAbbas]

Summary

The Windows tray icon looked washed-out and blurry — it read as the gray "offline" glyph even while the control plane was running. Two independent rendering bugs, both Windows-specific:

• Wrong theme signal. The glyph variant was picked from nativeTheme.shouldUseDarkColors, which on Windows tracks the apps theme. The taskbar follows the separately-configurable system theme. With mixed themes (dark taskbar + light apps is a common Windows setup) the tray wore a near-black glyph on a dark taskbar — effectively invisible, reading as the inactive/offline icon.
• Upscaled 16px bitmap. The tray image was built from 1x/1.5x/2x PNG representations, but the Windows tray ignores scale-factor representations ([Feature Request]: Support for high DPI variations in tray & window icons electron/electron#33044) and the shell upscales the 16px bitmap on >100% displays — fuzzy at the 125–150% scaling most Windows laptops run.

Changes

• tray-model.ts: new darkTaskbar() helper picks the theme source per platform — shouldUseDarkColorsForSystemIntegratedUI (the system/taskbar theme) on win32, shouldUseDarkColors elsewhere. Pure function, unit-tested.
• tray.ts: on win32, load the tray image with nativeImage.createFromPath(<ico>) so Electron serves a DPI-correct frame (it only does this for path-loaded .ico); Linux keeps the PNG-representation path. The 5s poll now re-checks the taskbar theme too, since Windows doesn't reliably emit nativeTheme updated when only the system theme flips; the icon/menu still only re-render on actual change.
• make-icons.mjs: emits one multi-size .ico per tray variant (16/20/24/32/48 frames; 20 covers 125% scaling), mirroring the existing icns builder. The four generated .ico files are committed alongside the existing PNGs.

Packaged builds need no electron-builder changes: Electron's ReadICOFromPath extracts asar-packed icos to a temp file before the Win32 LoadImage call.

Test plan

• npm run typecheck, npm test (223 passing, incl. new darkTaskbar contract tests: dark taskbar + light apps → light glyph, and vice versa)
• All four .ico files parse as well-formed 5-frame icons with matching directory/IHDR dimensions
• npm run dist:dir packages successfully; app.asar contains the icos
• Manually verified on Windows 11: gold-dot glyph shows while the control plane is running, matches the taskbar theme, and is crisp at >100% scaling

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