fix: All tickets link, redesign side panel into triage panel

- Fix sidebar All tickets link: /?view=all instead of / (avoids dashboard redirect)
- Replace useless side panel with triage command center:
  - Quick status change buttons (click to transition inline)
  - Assign to me button (appears when unassigned)
  - Mini activity feed showing last 8 transactions with type labels,
    status badges, old→new values, and comment previews
  - Relative timestamps
  - Open full view button
- Fetches ticket transactions on selection

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/components/app-shell.tsx

@@ -162,8 +162,8 @@ function SidebarNav() {
   const views = [
     {
       label: "All tickets",
-      href: "/",
-      param: null,
+      href: "/?view=all",
+      param: "all",
       count: counts.all,
       icon: LayoutGridIcon,
     },