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/tracker-infrastructure.providers.ts

@@ -5,6 +5,7 @@ import {
 import {
   ActivityGateway,
   AttachmentsGateway,
+  ProposalsGateway,
   CommentsGateway,
   IssuesGateway,
   NotificationsGateway,
@@ -28,6 +29,7 @@ import {
 import { GraphqlIssuesGateway } from './adapters/graphql-issues.gateway';
 import { GraphqlNotificationsGateway } from './adapters/graphql-notifications.gateway';
 import { HttpAttachmentsGateway } from './adapters/http-attachments.gateway';
+import { HttpProposalsGateway } from './adapters/http-proposals.gateway';
 import { GraphqlProjectsGateway } from './adapters/graphql-projects.gateway';
 import { GraphqlRealtimeGateway } from './adapters/graphql-realtime.gateway';
 import { GraphqlSavedFiltersGateway } from './adapters/graphql-saved-filters.gateway';
@@ -46,6 +48,7 @@ export function provideTrackerInfrastructure(): EnvironmentProviders {
     { provide: ReleasesGateway, useClass: GraphqlReleasesGateway },
     { provide: ActivityGateway, useClass: GraphqlActivityGateway },
     { provide: AttachmentsGateway, useClass: HttpAttachmentsGateway },
+    { provide: ProposalsGateway, useClass: HttpProposalsGateway },
     { provide: UsersGateway, useClass: GraphqlUsersGateway },
     { provide: NotificationsGateway, useClass: GraphqlNotificationsGateway },
     { provide: TrackerRealtimeGateway, useClass: GraphqlRealtimeGateway },