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/infrastructure/src/lib/mongo/find.repositories.ts

@@ -50,6 +50,7 @@ const commentFromDoc = (doc: CommentDoc): CommentReadModel => ({
   ...fromDoc(doc),
   replyTo: doc.replyTo ?? null,
   deleted: doc.deleted ?? false,
+  reactions: doc.reactions ?? [],
 });
 
 const escapeRegex = (text: string) =>
@@ -63,6 +64,7 @@ function toProject(doc: ProjectDoc): ProjectReadModel {
   return {
     ...fromDoc(rest),
     isPublic: rest.isPublic ?? false,
+    acceptsProposals: rest.acceptsProposals ?? false,
     settings: rest.settings ?? defaultProjectSettings(),
   };
 }

libs/api/tracker/infrastructure/src/lib/mongo/read-model.schemas.ts

@@ -293,6 +293,8 @@ export function issueFromDoc(doc: IssueDoc): IssueReadModel {
     // Tickets projected before attachments existed have none.
     attachments: rest.attachments ?? [],
     watchers: rest.watchers ?? [],
+    votes: rest.votes ?? 0,
+    voterIds: rest.voterIds ?? [],
     parent: rest.parent?.id ? rest.parent : null,
     rank: rest.rank ?? implicitRank(rest.number),
     startDate: rest.startDate ?? null,