Feature: Dock icon magnification and spacing setting

[Y-Akamirsky]

Description

I wouldn't exactly say I want to merge my PR - think of this code more as just an idea. If you do want to pull it in, make sure to double-check everything and fix the bugs, as I'm pretty doubtful about its quality.

Changes:

• Magnification effect (Modules/Dock/DockApps.qml): Icons under the cursor smoothly scale up, with the dock itself expanding to follow the pointer. Implemented via a HoverHandler-driven globalMagFactor, a cosine-based falloff (magFactor/magSpread), and a visualWrapper that scales each icon from the dock edge. Maintains the existing 1.2× layout metrics and spring-based drag shifting.
• Settings (Common/SettingsData.qml, Common/settings/SettingsSpec.js, Modules/Settings/DockTab.qml):
• New "Magnification" card: enable toggle, Magnification Amount (capped at 170%), and Effect Spread.
• New App Spacing control (capped at 10px) replacing the previously hardcoded inter-icon gap (layoutFlow.spacing).
• New keys registered in the settings schema so they persist correctly.
• Tooltip fix (Modules/Dock/DockBody.qml):
• Tooltips now position above the fully magnified icon using the configured Magnification Amount, so they never overlap icons — including on first hover before the scale animation completes.
  Defaults: All new behavior is off by default (Magnification disabled, Amount 160%, Spread 3.8× icon size, App Spacing 4px).

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that changes existing behavior)
• Refactor / internal cleanup
• Documentation
• Other

Related issues

Screenshots / video

Checklist

• My code follows the conventions in CONTRIBUTING.md
• I have tested my changes locally
• New user-facing strings are wrapped in I18n.tr() with translator context, reusing existing terms where possible
• Go changes: ran make fmt, added/updated tests, make test passes, and go mod tidy is clean
• QML changes: ran make lint-qml with no new warnings
• I have opened a corresponding pull request in dlx-docs to document any new behaviors: https://github.com/AvengeMedia/DankLinux-Docs