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/application/src/lib/commands/vote-issue.command-handler.ts

@@ -0,0 +1,33 @@
+import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
+import {
+  BusinessRuleError,
+  ForbiddenError,
+} from '@task-stream/api/shared/domain';
+import { CommandResult, ack } from './command-result';
+import { VoteIssueCommand } from './vote-issue.command';
+import { WriteAccess } from './write-access';
+
+/**
+ * Anyone signed in votes on a public project's tickets (that is the point:
+ * the people it is for say what they want); on a private one, its members.
+ */
+@CommandHandler(VoteIssueCommand)
+export class VoteIssueCommandHandler
+  implements ICommandHandler<VoteIssueCommand>
+{
+  constructor(private readonly access: WriteAccess) {}
+
+  async execute(command: VoteIssueCommand): Promise<CommandResult> {
+    const issue = await this.access.issue(command.issueId);
+    const project = await this.access.project(issue.projectId);
+    if (!project.isPublic && !project.isMember(command.actorId))
+      throw new ForbiddenError(
+        `You are not a member of project ${project.key}`,
+      );
+    if (issue.trashedAt)
+      throw new BusinessRuleError(`${issue.key} is in the trash`);
+    issue.vote(command.actorId, command.on);
+    await issue.commitAndWait();
+    return ack(issue);
+  }
+}