[IMP] selection: allow to de-select a zone

[rmbh-odoo]

Description:

Before this pr:

• Ctrl+Click on a selected cell had no effect.
• Users could add to the selection, but couldn't remove cells or zones.

Issue Example:

1. Select range A1:C3.
2. Ctrl+Click on B2.
3. Expected: Selection splits into A1:C1, A2, C2, A3:C3.
4. Previously, Ctrl+Click did not deselect B2.

After this pr:

• Ctrl+Click on a selected cell now removes it.
• The selection splits into separate zones as needed.

Technical Changes:

• UpdateSelection is now triggered on mouseup, allowing precise detection of Ctrl+Click behavior.
• The selection logic removes the zone from any existing selection zones.
• Splits overlapping zones into non-overlapping parts.

Task: 4647187

review checklist

• [ ] feature is organized in plugin, or UI components
• [ ] support of duplicate sheet (deep copy)
• [ ] in model/core: ranges are Range object, and can be adapted (adaptRanges)
• [ ] in model/UI: ranges are strings (to show the user)
• [ ] undo-able commands (uses this.history.update)
• [ ] multiuser-able commands (has inverse commands and transformations where needed)
• [ ] new/updated/removed commands are documented
• [ ] exportable in excel
• [ ] translations (_t("qmsdf %s", abc))
• [ ] unit tested
• [ ] clean commented code
• [ ] track breaking changes
• [ ] doc is rebuild (npm run doc)
• [ ] status is correct in Odoo

[robodoo]