#7775 - Inconsistent selection highlight colors between Rectangle and Lasso tools compared to Micro mode

[mariam-khutuashvili]

The rectangle and lasso outline drawn while dragging a selection in Macromolecules mode now uses the same style as Molecules mode: a grey stroke and no fill. Previously it was #B4B9D6, and the lasso area was additionally filled with #E1E5EA at 50 %.

• SELECTION_OUTLINE_COLOR added to renderers/constants.ts (next to the shared SELECTION_COLOR) and used by both modes: Micro's lassoStyle in options.ts (value-identical) and Macro's SelectionView.
• The lasso is now a single closed path (d3.curveLinearClosed) with no fill, so the separate closing-line element and the fill-opacity are gone.
• Stroke width is deliberately left as is: Macro's outline lives under the zoom transform and scales with zoom, which is unrelated to this issue.
• Unit test added for SelectionView (rectangle attributes, lasso is one closed unfilled path).

Verified in the browser mid-drag for both tools against Molecules mode. No autotest screenshots capture a selection mid-drag, so no baselines change; CI here demonstrates no regression rather than proving the fix.

Check list

• unit-tests written
• e2e-tests written
• documentation updated
• PR name follows the pattern #1234 – issue name
• branch name doesn't contain '#'
• PR is linked with the issue
• base branch (master or release/xx) is correct
• task status changed to "Code review"
• reviewers are notified about the pull request