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/graphql/issue.resolver.ts

@@ -14,6 +14,7 @@ import {
   OptionalAuth,
 } from '@task-stream/api/identity/presenters';
 import {
+  BlockersService,
   CommentsService,
   IssuesService,
   WorkflowsService,
@@ -44,6 +45,7 @@ import {
   EpicGql,
   IssueGql,
   IssuePageGql,
+  IssueParentGql,
 } from './types';
 
 @Resolver(() => IssueGql)
@@ -52,6 +54,7 @@ export class IssueResolver {
     private readonly issuesService: IssuesService,
     private readonly commentsService: CommentsService,
     private readonly workflows: WorkflowsService,
+    private readonly blockers: BlockersService,
   ) {}
 
   @OptionalAuth()
@@ -154,6 +157,22 @@ export class IssueResolver {
     return this.workflows.allowedTransitions(issue);
   }
 
+  @ResolveField(() => [IssueParentGql], {
+    description:
+      'Open tickets it waits for: the ones that block it and the ones it depends on',
+  })
+  blockedBy(@Parent() issue: IssueReadModel) {
+    return this.blockers.blockedBy(issue);
+  }
+
+  @ResolveField(() => Boolean, { description: 'Whether I voted for it' })
+  voted(
+    @CurrentUser() me: User | undefined,
+    @Parent() issue: IssueReadModel,
+  ): boolean {
+    return !!me && issue.voterIds.includes(me.id);
+  }
+
   @ResolveField(() => [IssueGql], { description: 'Linked tickets I can see' })
   linkedIssues(
     @CurrentUser() me: User | undefined,
@@ -307,6 +326,29 @@ export class IssueResolver {
     return this.issuesService.trash(me.id, issueId);
   }
 
+  @Mutation(() => CommandResultGql, {
+    description:
+      'A new ticket like this one: what it says, not where it stands (the key comes in the result)',
+  })
+  duplicateIssue(
+    @CurrentUser() me: User,
+    @Args('issueId', { type: () => ID }) issueId: string,
+  ) {
+    return this.issuesService.duplicate(me.id, issueId);
+  }
+
+  @Mutation(() => CommandResultGql, {
+    description:
+      'Vote for a ticket (on) or take the vote back: anyone signed in on a public project, members on a private one',
+  })
+  voteIssue(
+    @CurrentUser() me: User,
+    @Args('issueId', { type: () => ID }) issueId: string,
+    @Args('on') on: boolean,
+  ) {
+    return this.issuesService.vote(me.id, issueId, on);
+  }
+
   @Mutation(() => CommandResultGql, { description: 'Back from the trash' })
   restoreIssue(
     @CurrentUser() me: User,