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/issues.controller.ts

@@ -338,6 +338,45 @@ export class IssuesController {
     return this.issues.restore(me.id, await this.refs.issueId(me.id, issue));
   }
 
+  @Put('issues/:issue/vote')
+  @ISSUE
+  @ApiOperation({
+    summary: 'Vote for the ticket',
+    description:
+      'Anyone signed in, on a public project (that is the point: the people it is for say what they want); members on a private one. Voting twice changes nothing.',
+  })
+  @ApiOkResponse({ type: CommandResultDto })
+  @ApiCommandErrors()
+  async vote(@CurrentUser() me: User, @Param('issue') issue: string) {
+    return this.issues.vote(me.id, await this.refs.issueId(me.id, issue), true);
+  }
+
+  @Delete('issues/:issue/vote')
+  @ISSUE
+  @ApiOperation({ summary: 'Take back my vote for the ticket' })
+  @ApiOkResponse({ type: CommandResultDto })
+  @ApiCommandErrors()
+  async unvote(@CurrentUser() me: User, @Param('issue') issue: string) {
+    return this.issues.vote(
+      me.id,
+      await this.refs.issueId(me.id, issue),
+      false,
+    );
+  }
+
+  @Post('issues/:issue/duplicate')
+  @ISSUE
+  @ApiOperation({
+    summary: 'Duplicate the ticket',
+    description:
+      'Copies what it says (type, title, description, area, priority, labels, Figma, estimate, dates, parent and checklist steps, unticked), not where it stands: the copy starts in the first status, unassigned, out of sprints and releases, without comments or files. The result carries its key.',
+  })
+  @ApiCreatedResponse({ type: CommandResultDto })
+  @ApiCommandErrors()
+  async duplicate(@CurrentUser() me: User, @Param('issue') issue: string) {
+    return this.issues.duplicate(me.id, await this.refs.issueId(me.id, issue));
+  }
+
   @Get('projects/:project/trash')
   @ApiOptionalPireonAuth()
   @PROJECT