Option to disable shadow effect on pinned screenshots

[eevmanu]

ps: thx for your amazing work @DamirPorobic

Is your feature request related to a problem? Please describe.

Currently, when taking multiple screenshots and pinning them in the foreground, each screenshot has a shadow effect around its border. While this can be visually appealing, it becomes cumbersome when arranging and aligning screenshots for a final composed image. The shadows can create visual clutter and hinder precise positioning.

Describe the solution you'd like

Introduce a setting within the application that allows users to enable or disable the shadow effect on pinned screenshots. This would provide greater control over the visual presentation and facilitate easier alignment and composition when working with multiple captures.

This feature request seems related to a previous issue #365 which discussed customizing the appearance of pinned screenshots. The implementation might involve modifying the code for rendering the shadow effect, potentially around the area identified in

ksnip/src/gui/modelessWindows/pinWindow/PinWindow.cpp

Line 56 in 75d022d

mDropShadowEffect->setColor(QColor(160, 160, 160));

However, further investigation is needed to determine the exact interaction with other components and ensure a seamless integration.

Additional context

Here is an example of what I mean:

original	with annotations