Display branch name alongside title in termui and webui

This change adds the branch name alongside the title in both the terminal UI and the web UI, following up on commit a9b3822fd2cfdc035e7daa8b59496f9838a4b2c6 which added the branch_name parameter to the title tool.

Co-Authored-By: sketch <hello@sketch.dev>
diff --git a/loop/server/loophttp.go b/loop/server/loophttp.go
index b0aa65e..8df1fc4 100644
--- a/loop/server/loophttp.go
+++ b/loop/server/loophttp.go
@@ -54,6 +54,7 @@
 	TotalUsage           *ant.CumulativeUsage `json:"total_usage,omitempty"`
 	InitialCommit        string               `json:"initial_commit"`
 	Title                string               `json:"title"`
+	BranchName           string               `json:"branch_name,omitempty"`
 	Hostname             string               `json:"hostname"`    // deprecated
 	WorkingDir           string               `json:"working_dir"` // deprecated
 	OS                   string               `json:"os"`          // deprecated
@@ -373,6 +374,7 @@
 			WorkingDir:           getWorkingDir(),
 			InitialCommit:        agent.InitialCommit(),
 			Title:                agent.Title(),
+			BranchName:           agent.BranchName(),
 			OS:                   agent.OS(),
 			OutsideHostname:      agent.OutsideHostname(),
 			InsideHostname:       s.hostname,