feat: steadier live updates and notices for public proposals

- The web pings the live connection, reconnects when it goes quiet and
  reloads what each screen shows after reconnecting.
- Dropping a card on a column it cannot go to puts it back.
- Owners and admins get a notice when a proposal arrives.
- The proposal limit lives in Redis, so it holds across instances.
- REST tells whether I voted; pasted images leave the attachment list.
- Deleting a project removes its Git integration; no lint warnings left.
- Reactions and the blocked badge are components of their own.
- Docs: what is done and what is left (chapter 10), Word and PDF.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/web/tracker/presenters/src/lib/pages/issue.page.scss

@@ -562,102 +562,6 @@ a.ts-key {
   align-items: center;
 }
 
-// Waiting for other tickets: shown next to the key, with links to them.
-.ts-blocked {
-  display: inline-flex;
-  flex-wrap: wrap;
-  gap: 0.375rem;
-  align-items: center;
-  padding: 0.125rem 0.5rem;
-  border-radius: 999px;
-  background: color-mix(in srgb, var(--ts-c-red, #d33) 12%, transparent);
-  color: var(--ts-c-red, var(--ts-ink));
-  font-size: 0.8125rem;
-  font-weight: 600;
-  .ts-key {
-    color: inherit;
-  }
-}
-
-// 👍 2 · 🎉 1 · (+)
-.ts-reactions {
-  display: flex;
-  flex-wrap: wrap;
-  gap: 0.375rem;
-  align-items: center;
-  margin-top: 0.5rem;
-}
-.ts-reaction {
-  display: inline-flex;
-  gap: 0.25rem;
-  align-items: center;
-  // @pi/ui styles every <button> too specifically to override otherwise.
-  min-width: 0 !important;
-  height: auto !important;
-  padding: 0.125rem 0.5rem !important;
-  border: 1px solid var(--ts-line) !important;
-  border-radius: 999px !important;
-  background: var(--ts-surface);
-  color: inherit;
-  font: inherit;
-  font-size: 0.875rem;
-  cursor: pointer;
-  .ts-mono {
-    font-size: 0.75rem;
-  }
-  &.is-mine {
-    border-color: var(--ts-brand) !important;
-    background: color-mix(in srgb, var(--ts-brand) 12%, var(--ts-surface));
-  }
-  &:disabled {
-    cursor: default;
-  }
-}
-.ts-reaction-picker {
-  position: relative;
-  summary {
-    display: inline-grid;
-    place-items: center;
-    width: 1.75rem;
-    height: 1.625rem;
-    border: 1px dashed var(--ts-line-strong, var(--ts-line));
-    border-radius: 999px;
-    color: var(--ts-muted);
-    cursor: pointer;
-    list-style: none;
-    &::-webkit-details-marker {
-      display: none;
-    }
-  }
-}
-.ts-reaction-picker__menu {
-  position: absolute;
-  z-index: 5;
-  bottom: calc(100% + 0.375rem);
-  left: 0;
-  display: flex;
-  gap: 0.125rem;
-  padding: 0.25rem;
-  border: 1px solid var(--ts-line);
-  border-radius: 0.75rem;
-  background: var(--ts-surface);
-  box-shadow: 0 8px 24px rgb(0 0 0 / 14%);
-  button {
-    width: 2rem;
-    min-width: 0 !important;
-    height: 2rem;
-    padding: 0 !important;
-    border: 0 !important;
-    border-radius: 0.5rem !important;
-    background: none;
-    font-size: 1.125rem;
-    cursor: pointer;
-    &:hover {
-      background: color-mix(in srgb, var(--ts-brand) 12%, transparent);
-    }
-  }
-}
-
 .ts-votes {
   padding: 0.25rem 0.625rem;
   border: 1px solid var(--ts-line);