feat(ui): active agents panel, sidebar context, and page enhancements

Add live ActiveAgentsPanel with real-time transcript feed, SidebarContext
for responsive sidebar state, agent config form with reasoning effort,
improved inbox with failed run alerts, enriched issue detail with project
picker, and various component refinements across pages.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/components/agent-config-primitives.tsx

@@ -18,6 +18,7 @@ export const help: Record<string, string> = {
   cwd: "The working directory where the agent operates. Use an absolute path on the machine running Paperclip.",
   promptTemplate: "The prompt sent to the agent on each heartbeat. Supports {{ agent.id }}, {{ agent.name }}, {{ agent.role }} variables.",
   model: "Override the default model used by the adapter.",
+  thinkingEffort: "Control model reasoning depth. Supported values vary by adapter/model.",
   dangerouslySkipPermissions: "Run Claude without permission prompts. Required for unattended operation.",
   dangerouslyBypassSandbox: "Run Codex without sandbox restrictions. Required for filesystem/network access.",
   search: "Enable Codex web search capability during runs.",