feat: variable descriptions (#8269)

* feat: add description column to various tables and enhance UI interactions
- Introduced a description column in Headers, VarsTable, and other components to allow multi-line descriptions.
- Added toggle buttons to show/hide the description column in relevant tables.
- Updated EditableTable component to support dynamic row addition with customizable labels.
- Enhanced UI for better user experience with consistent button styles and spacing adjustments.

* chore: resize fix handles

* fix: restrict column check for last index

* refactor: remove unwanted style and fix bottom padding of the last child in the table row

* tests: improve testability and fix impacted locators

* tests: fix locators for value fields

* fix: improve newline handling in description prefix

* fix: ts changes

* chore: remove redundant code and fix description roundtrip

* chore: remove redundant check

* tests(bru-lang): tests for description and annotation

* test: improve locators and tests

* tests: descriptions

* chore: re-add description setup

* fix: re-add description cols

* chore: fix the double click reset

* fix: account for hidden sidebar in request pane width calculation

* refactor: ui/ux fixes for data type toggle

* chore: inline common deps into bruno-lang and bruno-schema

* chore: tests

* chore: fix ux for descriptions

* fix: layout for environment vars table

* fix: ensure correct row selection for multipart file upload in tests

* feat: enhance UID assignment for request headers and variables in collections

* chore: simplify

* chore: update pkg

* chore: abstract the e2e utils

* chore: fix exports

* tests: fix locators for datatype vars

* fix: ux issue with secrets in environment table

* tests: update locators for collection headers and vars descriptions

* tests: update locators to use data attributes for datatype selectors

* chore: update default css width for actions column

* chore: remove tooltip for string type warnings

* fix: reduce name widths

* refactor: update annotation serialization to use single-quote delimiters for descriptions

* refactor(tests): simplify description formatting in jsonToEnv tests

* feat: add multiline description escaping and unescaping functions with tests

* refactor: clean up imports and improve multiline text block handling

* refactor: update locators to use new test IDs for environment variable editors

* refactor: streamline header input handling and improve environment variable row access

* refactor: update e2e-test job to support self-hosted runners

* refactor: update E2E test runner configuration to include e2e and macOS environments

---------

Co-authored-by: Pragadesh-45 <temporaryg7904@gmail.com>

tests/folder/description/write-folder-vars-description.spec.ts

@@ -0,0 +1,39 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import { test, expect } from '../../../playwright';
+import { openFolderSettings, setTableRowDescriptionValue } from '../../utils/page';
+
+test.describe('Folder Settings Descriptions - Write (Vars)', () => {
+  test('writes a multiline description to a pre-request var and persists it to folder.bru', async ({
+    pageWithUserData: page,
+    collectionFixturePath
+  }) => {
+    await openFolderSettings(page, 'fold-description');
+
+    await page.getByTestId('folder-settings-tab-vars').click();
+
+    const varsTable = page.getByTestId('folder-vars-req');
+    await expect(varsTable.locator('tbody tr').first()).toBeVisible();
+
+    const plainRowIndex = await varsTable.locator('[data-testid="column-name"] input').evaluateAll(
+      (inputs) => inputs.findIndex((el) => (el as HTMLInputElement).value === 'plain')
+    );
+    if (plainRowIndex === -1) throw new Error('\'plain\' var not found in pre-request vars table');
+
+    const plainRow = varsTable.locator('tbody tr').nth(plainRowIndex);
+    await setTableRowDescriptionValue(plainRow, 'First line\nSecond line');
+
+    const descCell = plainRow.getByTestId('column-description');
+    await expect(descCell.locator('.CodeMirror-line').nth(0)).toHaveText('First line');
+    await expect(descCell.locator('.CodeMirror-line').nth(1)).toHaveText('Second line');
+
+    await page.getByRole('button', { name: 'Save' }).click();
+    await expect(page.getByText('Folder Settings saved successfully')).toBeVisible({ timeout: 5000 });
+
+    const folderBruPath = path.join(collectionFixturePath!, 'api', 'folder.bru');
+    const fileContent = fs.readFileSync(folderBruPath, 'utf8');
+
+    expect(fileContent).toContain('First line');
+    expect(fileContent).toContain('Second line');
+  });
+});