refactor: remove Qt5Compat dependency

[bbedward]

Summary

Use qt6 MultiEffect to clip the floating image corners instead of Qt5 OpacityMask

Use Case

Removes the Qt5Compat dependency, which DMS users may not have installed by default

Changes

Related Issues

Testing

Screenshots / Screen Recordings

Checklist

• I have tested these changes on my setup
• I have updated the documentation (README, IPC/settings docs) if needed
• I have verified the plugin loads without errors

Summary by Sourcery

Remove the Qt5Compat dependency from floating image rendering.

Enhancements:

• Replace the Qt5Compat opacity mask with Qt 6 MultiEffect masking for rounded floating images.

Build:

• Remove the Qt5Compat GraphicalEffects dependency from the documented requirements.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR removes the Qt5Compat GraphicalEffects dependency by replacing the OpacityMask-based corner clipping of floating images with Qt6’s MultiEffect and a dedicated Rectangle mask, and updates the README to no longer list Qt5Compat as a requirement.

Flow diagram for updated floating image corner clipping with MultiEffect

flowchart LR
    PanelWindow --> img
    img --> MultiEffect
    imgMask[Rectangle imgMask]
    imgMask --> MultiEffect

    subgraph MaskSetup
        imgMask --- img
    end

    subgraph EffectLayer
        MultiEffect --> ClippedImage[img with clipped corners]
    end

    ClippedImage --> PanelWindow

Loading

File-Level Changes

Change	Details	Files
Replace Qt5Compat OpacityMask usage with Qt6 MultiEffect-based masking for floating image corner clipping.	Switch QML import from Qt5Compat.GraphicalEffects to QtQuick.Effects Change layer.effect from GE.OpacityMask to MultiEffect with maskEnabled and maskSource Introduce a reusable Rectangle-based mask object that mirrors the image size and corner radius and is used as the MultiEffect mask source	components/floating/FloatWindow.qml
Remove Qt5Compat GraphicalEffects from documented dependencies.	Delete the Qt5Compat GraphicalEffects / qt6-qt5compat line from the dependency table in the README	README.md

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="components/floating/FloatWindow.qml" line_range="401-408" />
<code_context>
             }
         }

+        Rectangle {
+            id: imgMask
+            anchors.fill: img
+            radius: Math.max(0, Theme.cornerRadius - window.borderWidth)
+            visible: false
+            antialiasing: true
+            layer.enabled: true
+        }
+
</code_context>
<issue_to_address>
**suggestion (performance):** Re-evaluate whether `imgMask.layer.enabled: true` is necessary, as it may introduce extra offscreen rendering.

Because this Rectangle is only used as `maskSource` and never shown, enabling its layer likely causes an unnecessary offscreen render pass. If `MultiEffect` can sample `maskSource` from a non-layer Item (as expected), you can remove `layer.enabled: true` on `imgMask` to avoid the extra overhead.

```suggestion
        Rectangle {
            id: imgMask
            anchors.fill: img
            radius: Math.max(0, Theme.cornerRadius - window.borderWidth)
            visible: false
            antialiasing: true
        }
```
</issue_to_address>

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