Support for the Japanese-style segno and coda

Your idea

Allow to add Japanese-style segno and coda symbols from the palette.

Problem to be solved

In Japanese sheet music, Japanese-style Segno and Coda symbols are commonly used.
However, in MuseScore, these symbols cannot be added from the Master Palette, so users need to copy and paste them from here instead.
They should be made available from the Palette or Master Palette, and should be automatically positioned in the same way as the standard Segno and Coda symbols.

Prior art

No response

Additional context

#21322
In the current version, there is a bug where Japanese-style Segno and Coda symbols disappear even when added via copy and paste.

(I'm Japanese, so my English might not be perfect. Please excuse any mistakes I might make.)

Checklist

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Start by inspecting the Master Palette handling for the standard Segno and Coda symbols and the positioning behavior used when they are placed. Add the Japanese-style variants shown in the SMuFL repeats reference, make them available from the Palette or Master Palette, and verify that they remain visible and are positioned like the standard symbols.