test(cypress): standardize file and directory naming to kebab-case

Rename all Cypress E2E directories and test files to consistent
kebab-case convention:

- Directories: Formatting/ → formatting/, Lists/ → lists/,
  Heading/ → heading/, Heading/Change/ → heading/change/,
  Heading/KeyboardShortcuts/ → heading/keyboard-shortcuts/,
  Toc/ → toc/
- Files: Bold.cy.js → bold.cy.js, BulletList.cy.js → bullet-list.cy.js,
  TaskList.cy.js → task-list.cy.js, etc. (21 files)
- Remove redundant e2e- prefix from 3 files already inside cypress/e2e/
- Relocate 2 root-level legacy files into their proper subdirectories
- Rename 4 camelCase files in cypress-commands/ to kebab-case
- Remove 1 duplicate file (e2e-doc-structure-generator.cy.js)

No test logic changes. Import paths updated where needed.

Made-with: Cursor

Author: HMarzban

…e/cypress-commands/createSelection.cy.js …/cypress-commands/create-selection.cy.jspackages/webapp/cypress/e2e/cypress-commands/createSelection.cy.js renamed to packages/webapp/cypress/e2e/cypress-commands/create-selection.cy.js packages/webapp/cypress/e2e/cypress-commands/createSelection.cy.js renamed to packages/webapp/cypress/e2e/cypress-commands/create-selection.cy.js

@@ -1,13 +1,13 @@
 /* eslint-disable no-undef */
-import { TEST_CONTENT, TEST_TITLE } from '../../support/commands'
+import { TEST_CONTENT, TEST_TITLE } from '../../../support/commands'
 import {
   heading,
   paragraph,
   listItem,
   orderedList,
   section,
   bulletList
-} from '../../fixtures/docMaker'
+} from '../../../fixtures/docMaker'
 
 const DocumentStructure = {
   documentName: TEST_TITLE.HelloDocy,