feat: auto-name surface tabs from work metadata

Resources/Localizable.xcstrings

@@ -13871,6 +13871,23 @@
         }
       }
     },
+    "tabBar.autoTitle.pullRequest": {
+      "extractionState": "manual",
+      "localizations": {
+        "en": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "PR #%lld"
+          }
+        },
+        "ja": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "PR #%lld"
+          }
+        }
+      }
+    },
     "tabBar.newTerminalTab": {
       "extractionState": "manual",
       "localizations": {

Sources/Workspace+Bonsplit.swift

@@ -598,7 +598,7 @@ extension Workspace: @preconcurrency BonsplitDelegate {
             pendingDetachedSurfaces[tabId] = DetachedSurfaceTransfer(
                 panelId: panelId,
                 panel: panel,
-                title: resolvedPanelTitle(panelId: panelId, fallback: transferFallbackTitle),
+                title: panelCustomTitles[panelId] ?? transferFallbackTitle,
                 icon: panel.displayIcon,
                 iconImageData: browserPanel?.faviconPNGData,
                 kind: surfaceKind(for: panel),

Sources/Workspace+Persistence.swift

@@ -285,7 +285,7 @@ extension Workspace {
     private func sessionPanelSnapshot(panelId: UUID, includeScrollback: Bool) -> SessionPanelSnapshot? {
         guard let panel = panels[panelId] else { return nil }
 
-        let panelTitle = panelTitle(panelId: panelId)
+        let panelTitle = panelTitles[panelId] ?? panel.displayTitle
         let customTitle = panelCustomTitles[panelId]
         let directory = panelDirectories[panelId]
         let isPinned = pinnedPanelIds.contains(panelId)

Sources/Workspace+SidebarTelemetry.swift

@@ -110,12 +110,15 @@ extension Workspace {
         let state = SidebarGitBranchState(branch: normalizedBranch, isDirty: isDirty)
         let existing = panelGitBranches[panelId]
         let branchChanged = existing?.branch != nil && existing?.branch != normalizedBranch
+        var titleMetadataChanged = false
         if existing?.branch != normalizedBranch || existing?.isDirty != isDirty {
             panelGitBranches[panelId] = state
+            titleMetadataChanged = true
         }
         if branchChanged {
             if panelPullRequests[panelId] != nil {
                 panelPullRequests.removeValue(forKey: panelId)
+                titleMetadataChanged = true
             }
             if panelId == focusedPanelId, pullRequest != nil {
                 pullRequest = nil
@@ -124,14 +127,20 @@ extension Workspace {
         if panelId == focusedPanelId, gitBranch != state {
             gitBranch = state
         }
+        if titleMetadataChanged {
+            syncResolvedPanelTitle(panelId: panelId)
+        }
     }
 
     func clearPanelGitBranch(panelId: UUID) {
+        var titleMetadataChanged = false
         if panelGitBranches[panelId] != nil {
             panelGitBranches.removeValue(forKey: panelId)
+            titleMetadataChanged = true
         }
         if panelPullRequests[panelId] != nil {
             panelPullRequests.removeValue(forKey: panelId)
+            titleMetadataChanged = true
         }
         if panelId == focusedPanelId {
             if gitBranch != nil {
@@ -141,6 +150,9 @@ extension Workspace {
                 pullRequest = nil
             }
         }
+        if titleMetadataChanged {
+            syncResolvedPanelTitle(panelId: panelId)
+        }
     }
 
     func updatePanelPullRequest(
@@ -208,6 +220,7 @@ extension Workspace {
         )
         if existing != state {
             panelPullRequests[panelId] = state
+            syncResolvedPanelTitle(panelId: panelId)
         }
         if panelId == focusedPanelId, pullRequest != state {
             pullRequest = state
@@ -217,6 +230,7 @@ extension Workspace {
     func clearPanelPullRequest(panelId: UUID) {
         if panelPullRequests[panelId] != nil {
             panelPullRequests.removeValue(forKey: panelId)
+            syncResolvedPanelTitle(panelId: panelId)
         }
         if panelId == focusedPanelId, pullRequest != nil {
             pullRequest = nil
@@ -287,9 +301,13 @@ extension Workspace {
         logEntries.removeAll()
         progress = nil
         gitBranch = nil
+        let panelIdsWithAutomaticTitles = Set(panelGitBranches.keys).union(panelPullRequests.keys)
         panelGitBranches.removeAll()
         pullRequest = nil
         panelPullRequests.removeAll()
+        for panelId in panelIdsWithAutomaticTitles {
+            syncResolvedPanelTitle(panelId: panelId)
+        }
         // Clears bypass updatePanelAgentState/clearPanelAgentState's per-surface notify, so fan
         // it out here too -- otherwise a surface.wait `agent_state` (or a subscribed client)
         // watching a surface whose state got wiped by a sidebar reset would hang until timeout
@@ -360,16 +378,8 @@ extension Workspace {
         panelsWithLiveTitle.insert(panelId)
 
         // Update bonsplit tab title only when this panel's title changed.
-        if didMutate,
-           let tabId = surfaceIdFromPanelId(panelId),
-           let panel = panels[panelId] {
-            let baseTitle = panelTitles[panelId] ?? panel.displayTitle
-            let resolvedTitle = resolvedPanelTitle(panelId: panelId, fallback: baseTitle)
-            bonsplitController.updateTab(
-                tabId,
-                title: resolvedTitle,
-                hasCustomTitle: panelCustomTitles[panelId] != nil
-            )
+        if didMutate {
+            syncResolvedPanelTitle(panelId: panelId)
         }
 
         // The focused pane titles the workspace (tmux-style). Single-panel

Sources/Workspace.swift

@@ -992,9 +992,49 @@ final class Workspace: Identifiable, ObservableObject {
            !custom.isEmpty {
             return custom
         }
+        if let pullRequest = panelPullRequests[panelId] {
+            let panelBranch = normalizedSidebarBranchName(panelGitBranches[panelId]?.branch)
+            let pullRequestBranch = normalizedSidebarBranchName(pullRequest.branch)
+            if pullRequestBranch == nil || panelBranch == pullRequestBranch {
+                return String(
+                    localized: "tabBar.autoTitle.pullRequest",
+                    defaultValue: "PR #\(pullRequest.number)"
+                )
+            }
+        }
+        if let branch = normalizedSidebarBranchName(panelGitBranches[panelId]?.branch) {
+            return Self.ticketIdentifier(in: branch) ?? branch
+        }
         return fallbackTitle
     }
 
+    private static let ticketIdentifierPattern = try? NSRegularExpression(
+        pattern: #"(?<![A-Za-z0-9])([A-Z][A-Z0-9]+-[0-9]+)(?![A-Za-z0-9])"#
+    )
+
+    private static func ticketIdentifier(in branch: String) -> String? {
+        guard let ticketIdentifierPattern,
+              let match = ticketIdentifierPattern.firstMatch(
+                  in: branch,
+                  range: NSRange(branch.startIndex..., in: branch)
+              ),
+              match.numberOfRanges > 1,
+              let range = Range(match.range(at: 1), in: branch) else {
+            return nil
+        }
+        return String(branch[range])
+    }
+
+    func syncResolvedPanelTitle(panelId: UUID) {
+        guard let panel = panels[panelId], let tabId = surfaceIdFromPanelId(panelId) else { return }
+        let baseTitle = panelTitles[panelId] ?? panel.displayTitle
+        bonsplitController.updateTab(
+            tabId,
+            title: resolvedPanelTitle(panelId: panelId, fallback: baseTitle),
+            hasCustomTitle: panelCustomTitles[panelId] != nil
+        )
+    }
+
     func syncPinnedStateForTab(_ tabId: TabID, panelId: UUID) {
         let isPinned = pinnedPanelIds.contains(panelId)
         if let panel = panels[panelId] {
@@ -1097,13 +1137,7 @@ final class Workspace: Identifiable, ObservableObject {
             panelCustomTitles[panelId] = trimmed
         }
 
-        guard let panel = panels[panelId], let tabId = surfaceIdFromPanelId(panelId) else { return }
-        let baseTitle = panelTitles[panelId] ?? panel.displayTitle
-        bonsplitController.updateTab(
-            tabId,
-            title: resolvedPanelTitle(panelId: panelId, fallback: baseTitle),
-            hasCustomTitle: panelCustomTitles[panelId] != nil
-        )
+        syncResolvedPanelTitle(panelId: panelId)
     }
 
     func isPanelPinned(_ panelId: UUID) -> Bool {