feat: add markdown table generator

[SSDWGG]

What changed

Adds a new Markdown Table Generator tool for building GitHub-flavored Markdown tables from a visual editor.

• registers /markdown-table-generator in the Development tools list
• supports editable headers, cells, row/column add/remove actions, and per-column alignment
• escapes | characters and converts multiline cells to <br> so generated tables stay valid
• adds unit coverage for table creation, escaping, alignment output, and uneven row padding

Closes #542

Validation

• pnpm vitest run src/tools/markdown-table-generator/markdown-table-generator.service.test.ts
• pnpm typecheck
• pnpm lint (passes with existing UnoCSS warnings in unrelated files)
• pnpm build
• local UI smoke test at /markdown-table-generator: edited headers/cells and verified the generated Markdown output updates, including pipe escaping and multiline cell handling

Screenshots

Validated locally in desktop and mobile viewports.

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[SSDWGG]

I fixed the Sonar reliability issues by adding scope="col" to the generated table header cells. Local verification after the update: pnpm vitest run src/tools/markdown-table-generator/markdown-table-generator.service.test.ts passed, pnpm typecheck passed, and pnpm lint passed with only the existing unrelated UnoCSS ordering warnings. The remaining E2E failure appears to be Playwright dependency installation on the GitHub runner (libasound2, libffi7, and libx264-163 unavailable on Ubuntu 24.04), not a failure in this tool code.

[sharevb]

Hi @SSDWGG , if you are interested in an up to date version of it-tools, with many improvements, new tools, and bug fixes, as this repo is almost no more maintained, I made a fork here : https://github.com/sharevb/it-tools (https://sharevb-it-tools.vercel.app/ and docker images https://github.com/sharevb/it-tools/pkgs/container/it-tools)

Feel free to open a PR in my fork