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/web/tracker/infrastructure/src/lib/adapters/graphql-collaboration.gateways.ts

@@ -21,6 +21,7 @@ import {
   DeleteCommentDocument,
   EditCommentDocument,
   IssueCommentsDocument,
+  ReactToCommentDocument,
   PublishReleaseDocument,
   ReleaseBurnupDocument,
   ReleaseNotesDraftDocument,
@@ -52,6 +53,16 @@ export class GraphqlCommentsGateway extends CommentsGateway {
       .pipe(map((d) => toCommandResult(d.addComment)));
   }
 
+  react(
+    commentId: string,
+    emoji: string,
+    on: boolean,
+  ): Observable<CommandResult> {
+    return this.gql
+      .mutate(ReactToCommentDocument, { commentId, emoji, on })
+      .pipe(map((d) => toCommandResult(d.reactToComment)));
+  }
+
   edit(commentId: string, body: string): Observable<CommandResult> {
     return this.gql
       .mutate(EditCommentDocument, { commentId, body })