Render Markdown in feedback replies (responses are shown as raw text)

Description: Markdown is not rendered in the reply/response field on feedback posts. Whatever the admin types is output verbatim, so bold, - bullets, # headings and image syntax all appear as raw characters instead of formatted content. This is inconsistent within the very same post: the post description renders Markdown correctly (post templates even ship with Markdown headings), so users learn that Markdown works — and then it silently breaks the moment they reply. Same editor, same expectation, different output. Problem: Replies can't be structured. Bullet lists, numbered steps and headings collapse into one unreadable block of text with stray * and - characters. Screenshots can't be positioned inline. Images can only be appended, not placed next to the step they illustrate — which is exactly what a "here's how to do it" reply needs. Replies are the surface end users read most. A status update or an answer to a bug report is often the only thing a voter ever reads from the team, and it currently looks worse than the post it is answering. It breaks AI/MCP workflows. Teams drafting responses with Claude via the Sleekplan MCP get Markdown back by definition — that output currently has to be manually flattened before it can be posted. Steps to reproduce: Open any feedback post in the admin dashboard. Write a reply containing bold, a - bullet list and an image reference. Save and view the post on the public board / widget, and in the notification email. The Markdown syntax is displayed literally instead of being rendered. Expected behavior: Replies use the same Markdown pipeline as the post description — bold/italic, headings, lists, links, code and inline images — and render consistently on the board, in the widget and in the notification email that goes out to voters and subscribers. Benefit: Well-structured, readable responses for end users, no separate formatting rules to learn per field, and clean hand-off from AI-drafted content. This is the field where clear communication matters most, and today it is the only one that can't be formatted.