PTBAS-738: Adjust sync window

[MomdAli]

UI/UX Improvements for Sync Status and Task Addition

• The sync status message in the Mapping record and throughout the UI is now a styled TextFlow instead of a plain string, allowing for better formatting and the inclusion of bold task names and additional hints.
• Added a booking hint field to Mapping and display it as a tooltip in the sync status column, providing users with more context about each Heimat task.
• Replaced the old ComboBox and add button for Heimat tasks with a searchable popup (SearchPopup), making it easier to find and add tasks. The search field is cleared after each selection, and duplicate tasks are prevented.

Table and Tooltip Enhancements

• The project list in the table now includes tooltips for each project label, improving accessibility and clarity for users.
• The sync status column now uses a custom cell factory to display styled messages and tooltips, addressing cell height and formatting issues when using TextFlow.

Code Quality and Robustness

• Fixed a logic error in FileOpenHelper.openFile where the file existence check was inverted, ensuring files are only opened if they exist and are not directories.
• Improved observable list handling for table bindings, ensuring that new rows are properly tracked and bound for UI updates.