Enable side panels by default and increase edge trigger size

[xdonu2x]

Motivation

• Side panels were difficult to discover because the defaults hid them (leftEnabled/rightEnabled were false) and the edge hover trigger was only 2px, causing users to miss the activation area.
• Provide a safe runtime fallback so older or partial user configs that omit the sidePanels object do not silently disable the feature.

Description

• Enable side panels by default by setting leftEnabled and rightEnabled to true in both Commons/Settings.qml and Assets/settings-default.json.
• Increase the default triggerSize from 2 to 8 in Commons/Settings.qml, Assets/settings-default.json, and the runtime fallback in Modules/MainScreen/SideWidgetPanel.qml so edge-hover activation is easier.
• Add Modules/MainScreen/SideWidgetPanel.qml (new) which implements hover-reveal side panels, panel sizing, reveal/conceal timers, and loading of bar widgets for left/right sides.
• Integrate two SideWidgetPanel instances into Modules/MainScreen/MainScreen.qml and extend the mask regions to include panel bodies and trigger zones so pointer and click-to-close behavior remain correct.

Testing

• Validated Assets/settings-default.json parses successfully with python3 -c "import json; json.load(open('Assets/settings-default.json'))" (succeeded).
• Searched and inspected code locations with rg/nl to confirm defaults and runtime fallbacks are present in Commons/Settings.qml, Assets/settings-default.json, and Modules/MainScreen/SideWidgetPanel.qml (succeeded).
• Confirmed files staged and committed locally (commit message: Enable side panels by default and widen edge trigger).
• No runtime QML execution tests were available in this environment, so UI behavior validation should be performed in a running instance to confirm visible panels and hover activation (not run).

---

Codex Task