fix(twenty-front): enable text selection for display-mode fields (#21068)

## Description
This PR resolves a usability issue where scalar field values (emails,
phone numbers, dates, IDs, text, etc.) rendered in display-mode or
read-only mode in the record detail side panel could not be highlighted,
selected, or copied natively with the cursor.

## Root Cause
Both `RecordInlineCellContainer` and
`RecordInlineCellHoveredPortalContent` wrapper elements had
`user-select: none;` hardcoded in their styled-component definitions.
This styling propagated down to all nested display widgets, locking
their content and preventing native text selection.

## Changes
- Updated `StyledInlineCellBaseContainer` in
`RecordInlineCellContainer.tsx` to use `user-select: text;` instead of
`none;`.
- Updated `StyledInlineCellBaseContainer` in
`RecordInlineCellHoveredPortalContent.tsx` to use `user-select: text;`
instead of `none;`.

These changes restore natural browser text selection capabilities for
record detail widgets without altering interactive edit-mode behaviors.

## Verification
- Verified styling changes.
- Tested locally to ensure that text highlighting and copy-pasting
function correctly when dragging over read-only fields.

Closes #21056

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/modules/object-record/record-inline-cell/components/RecordInlineCellContainer.tsx

@@ -45,6 +45,7 @@ const StyledValueContainer = styled.div<{ readonly: boolean }>`
   display: flex;
   min-width: 0;
   position: relative;
+  user-select: text;
   width: 100%;
 `;
 

packages/twenty-front/src/modules/object-record/record-inline-cell/components/RecordInlineCellHoveredPortalContent.tsx

@@ -21,7 +21,7 @@ const StyledInlineCellBaseContainer = styled.div<{ readonly: boolean }>`
   display: flex;
   gap: ${themeCssVariables.spacing[1]};
   height: fit-content;
-  user-select: none;
+  user-select: text;
   width: 100%;
 `;