feat: formatted text, a list view, ticket details, public proposals and votes

Formatted text
- Descriptions, comments, replies and release notes render Markdown,
  sanitised with DOMPurify (tested against scripts, handlers and
  javascript: links). A pasted image is uploaded and written as
  ![name](attachment:<id>); the web fetches it with the reader's session,
  so it works on private projects. Every text box has a preview. The
  attachment upload now answers its attachmentId.

List view
- /p/:key/list: every ticket as rows, sortable by any column, filtered by
  text, open/closed, type, priority and assignee; status, priority and
  assignee change in place; bulk edit (the backlog's bar, now shared).

Ticket details
- Reactions on comments (GitHub's eight), for members and viewers.
- Duplicate a ticket: what it says, not where it stands.
- blockedBy: open tickets it waits for (BLOCKS / DEPENDS_ON), worked out
  when reading with one query per board or page; shown on cards, list
  rows and the ticket.

Public proposals
- A public project can take bug reports and ideas from anyone
  (acceptsProposals): POST /api/explore/projects/{project}/proposals and
  the form at /p/:key/proponer. They become tickets labelled «propuesta»,
  opened by TaskStream; a honeypot field and 5 per address every 15
  minutes keep spam out. No e-mail is asked: it would be public.

Votes
- Anyone signed in votes on a public project's tickets, members on a
  private one (voteIssue, PUT/DELETE /api/issues/{issue}/vote): votes and
  voted on each ticket, buttons on the ticket and the roadmap, a column
  in the list. The showcase carries votes and the open proposals.

MCP: vote_issue, duplicate_issue, react_to_comment; listings show
blockers and votes. Docs, Word and PDF updated; chat notifications
(Discord, Slack, Telegram) noted for later.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/api/tracker/presenters/src/lib/http/attachments.controller.ts

@@ -36,7 +36,7 @@ import { IssuesService } from '@task-stream/api/tracker/application';
 import type { Response } from 'express';
 import { viewerOf } from '../common/viewer';
 import { AttachFileDto } from './dto/requests.dto';
-import { CommandResultDto } from './dto/responses.dto';
+import { AttachmentResultDto, CommandResultDto } from './dto/responses.dto';
 import { Refs } from './refs';
 
 const ISSUE = ApiParam({
@@ -80,7 +80,7 @@ export class AttachmentsController {
       'Multipart with the file as `file` and, optionally, `commentId` to place it under a comment. ' +
       'Up to ATTACHMENTS_MAX_MB megabytes (25 by default) and 50 files per ticket.',
   })
-  @ApiCreatedResponse({ type: CommandResultDto })
+  @ApiCreatedResponse({ type: AttachmentResultDto })
   @ApiCommandErrors()
   async attach(
     @CurrentUser() me: User,