Qt Design Studio generates wrong code for image files in MCU projects (qmlprojectexporter fails)

22:35:08: 起動中: "C:\Qt\QtMCUs.6.0\bin\qmlprojectexporter.exe" C:/Users/81701/Documents/UntitledProject26/UntitledProject26.qmlproject --platform qt --toolchain mingw --include-dirs "C:/Qt/QtMCUs/2.6.0/include/qul,C:/Qt/QtMCUs/2.6.0/include/qul/Timeline" --outdir C:/Users/81701/AppData/Local/Temp/QtDesignStudio-BGKYdu
[qmlprojectexporter] warning: Problem during load of qmlproject file
[qmlprojectexporter] C:/Users/81701/Documents/UntitledProject26/UntitledProject26.qmlproject:10:5: warning: It is not recommended to use the 'directory' property. The build system might not be able to correctly track the contents of the directory, so always clean and rebuild whenever adding or removing files. Additionally, every file present in the directory at configure time will be added to the application binary, which might increase the memory footprint. Prefer explicit inclusion of the needed files using the 'files' property to avoid these issues.
    QmlFiles {
    ^~~~~~~~
[qmlprojectexporter] C:/Users/81701/Documents/UntitledProject26/UntitledProject26.qmlproject:18:5: warning: It is not recommended to use the 'directory' property. The build system might not be able to correctly track the contents of the directory, so always clean and rebuild whenever adding or removing files. Additionally, every file present in the directory at configure time will be added to the application binary, which might increase the memory footprint. Prefer explicit inclusion of the needed files using the 'files' property to avoid these issues.
    ImageFiles {
    ^~~~~~~~~~
C:/Users/81701/Documents/UntitledProject26/Screen01.ui.qml:24:9: error: Failed to find image in the resource system
        source: "images/bg1.png"
        ^~~~~~
qmltocpp -IC:/Qt/QtMCUs/2.6.0/include/qul -IC:/Qt/QtMCUs/2.6.0/include/qul/Timeline --mapModule=QtQuick.Controls=QtQuick.Controls.StyleDefault --qulrcc-json-file=C:/Users/81701/AppData/Local/Temp/QtDesignStudio-BGKYdu/resources/qulrcc_qmlproject_output.json --depfile=C:/Users/81701/AppData/Local/Temp/QtDesignStudio-BGKYdu/Screen01.d --outputDir=C:/Users/81701/AppData/Local/Temp/QtDesignStudio-BGKYdu --resources=C:/Users/81701/Documents/UntitledProject26/Screen01.ui.qml,UntitledProject26.qml,Screen01.ui.qml,UntitledProject26.qml --projectDir=C:/Users/81701/Documents/UntitledProject26 --qmlImportPath=C:/Users/81701/AppData/Local/Temp/QtDesignStudio-BGKYdu,C:/Qt/QtMCUs/2.6.0/src/controls/styles/Default,C:/Qt/QtMCUs/2.6.0/include,C:/Users/81701/Documents/UntitledProject26,C:/Qt/QtMCUs/2.6.0/include/qul/Default,C:/Qt/QtMCUs/2.6.0/src/controls,C:/Qt/QtMCUs/2.6.0/include/qul/Templates,C:/Users/81701/AppData/Local/Temp/QtDesignStudio-BGKYdu C:/Users/81701/Documents/UntitledProject26/Screen01.ui.qml
Error: process failed with exit code 1.
22:35:09: プロセス "C:\Qt\QtMCUs.6.0\bin\qmlprojectexporter.exe" はコード 1 で終了しました。
プロジェクト UntitledProject26 のビルド・デプロイ中にエラーが発生しました (キット Desktop Qt 6.5.2)
この問題は、キット Desktop Qt 6.5.2 の設定が原因かもしれません。
ステップ "Qt for MCUs Deploy Step" 実行中 ```
 

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## The insight and the workaround

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I can see this issue is caused by the mismatch between the spec of QmlProject file and the project file QDS generate.

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Initial qmlproject file QDS generate only have following for image files.

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```java
    ImageFiles {
        directory: "."
    } ```
And the spec for ImageFiles.directory says:

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> **Warning:** Images placed in subdirectories are not included. 
[ImageFiles.directory | QmlProject Manual 2.6 (qt.io)](https://doc.qt.io/QtForMCUs-2.6/qtul-qmlproject-imagefilesnode-directory.html)

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  One possible workground is adding following to the qmlproject file.
```java
    ImageFiles {
        directory: "images"
    } ```
I can see autogenerated code through Qt Bridge also produces this problem. I belive this is quite a serious problem many would encouneter in many different situations.

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