Standardize row height and cell alignment in EntityDataTable

[ousmaneo]

Motivation

The entity data table is the most-used surface in the UI, but rows had ragged heights, top-aligned content, no vertical gridlines, and permanently visible column drag/resize controls. This PR tacks the table toward an improved style tables (uniform rows, calmer headers, clearer column separation).

Changes

• Standardized row height — ROW_MIN_HEIGHT (38px) on data rows and override rows; cell content is vertically centered and single-line with ellipsis truncation by default. Columns whose content must wrap (e.g. the streams title cell) can opt out via a new wrapContent flag on ColumnRenderer.
• Column dividers — a border-right (same token as row dividers) is drawn only between attribute columns, so the bulk-select and (possibly empty) actions columns don't produce stray lines.
• Horizontal centering — cell content is centered by default by wiring up the previously unused ColumnRenderer.textAlign; title/name columns default to left via DefaultColumnRenderers, and link-rendering columns (index_set_title, event_definition_id, lookup table cache_id/ data_adapter_id) opt out per table.
• Hover-revealed header controls — column drag and resize handles fade in on header hover/focus (kept visible during an active drag/resize, and always visible on touch devices via @media (hover: none)).
• Streams title cell — reserves a two-line box (min-height: 2lh) so rows with and without a description have identical height; a lone title centers vertically.
  /nocl

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have requested a documentation update.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.