diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..6057ddc
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1 @@
+This project is vibe coded, no commit-by-commit review needed.
diff --git a/Sources/Timber/TimberApp.swift b/Sources/Timber/TimberApp.swift
index 98ccaac..d08a38b 100644
--- a/Sources/Timber/TimberApp.swift
+++ b/Sources/Timber/TimberApp.swift
@@ -31,27 +31,62 @@ final class SizingHostingView<Content: View>: NSHostingView<Content> {
     }
 }
 
-/// Action icons, loaded from the bundled PNGs by explicit URL (proven to
-/// resolve) instead of named lookup, with every scale wired so Retina
-/// picks the right representation.
+/// Action icons, loaded from the bundled PNGs by explicit URL instead of
+/// named lookup, with every scale wired so Retina picks the right
+/// representation.
+///
+/// The bundle is located defensively and never via Bundle.module: its
+/// synthesized accessor calls fatalError when the bundle is missing,
+/// which crashed the popover on first open in v0.1.1. A missing bundle
+/// or missing PNG degrades to an SF Symbol instead of trapping.
 enum TimberIcons {
-    static let zed = load("zed")
-    static let herdr = load("herdr")
+    static let zed = load("zed", fallbackSystemName: "terminal")
+    static let herdr = load("herdr", fallbackSystemName: "server.rack")
 
-    private static func load(_ name: String) -> NSImage {
+    private static func load(_ name: String, fallbackSystemName: String) -> NSImage {
+        if let image = bundledImage(named: name) {
+            return image
+        }
+        return NSImage(systemSymbolName: fallbackSystemName, accessibilityDescription: name) ?? NSImage()
+    }
+
+    private static func bundledImage(named name: String) -> NSImage? {
+        let dirs = candidateDirs()
+        guard let bundleURL = TimberModel.resourceBundleURL(bundleName: "Timber_Timber", candidateDirs: dirs) else {
+            return nil
+        }
+        guard let bundle = Bundle(url: bundleURL) else {
+            return nil
+        }
         let image = NSImage()
+        var found = false
         for scale in ["@3x", "@2x", ""] {
-            guard let url = Bundle.module.url(forResource: "\(name)\(scale)", withExtension: "png"),
-                  let src = NSImage(contentsOf: url)
-            else { continue }
+            guard let url = bundle.url(forResource: "\(name)\(scale)", withExtension: "png") else { continue }
+            guard let src = NSImage(contentsOf: url) else { continue }
+            found = true
             for rep in src.representations {
                 rep.size = NSSize(width: 14, height: 14)
                 image.addRepresentation(rep)
             }
         }
+        guard found else {
+            return nil
+        }
         image.size = NSSize(width: 14, height: 14)
         return image
     }
+
+    private static func candidateDirs() -> [URL] {
+        var dirs: [URL] = []
+        if let resources = Bundle.main.resourceURL {
+            dirs.append(resources)
+        }
+        dirs.append(Bundle.main.bundleURL)
+        if let executables = Bundle.main.executableURL?.deletingLastPathComponent() {
+            dirs.append(executables)
+        }
+        return dirs
+    }
 }
 
 final class AppDelegate: NSObject, NSApplicationDelegate {
diff --git a/Sources/TimberModel/TimberModel.swift b/Sources/TimberModel/TimberModel.swift
index 3c7fada..ccb0dbf 100644
--- a/Sources/TimberModel/TimberModel.swift
+++ b/Sources/TimberModel/TimberModel.swift
@@ -235,6 +235,25 @@ public enum TimberModel {
         "\"" + text.replacingOccurrences(of: "\\", with: "\\\\").replacingOccurrences(of: "\"", with: "\\\"") + "\""
     }
 
+    // MARK: - Resource bundle lookup
+
+    /// Locate `<name>.bundle` under the first candidate dir that
+    /// contains it, without trapping: unlike the synthesized
+    /// `Bundle.module` accessor (which calls fatalError when the bundle
+    /// is missing), absence yields nil so callers can degrade gracefully
+    /// (e.g. fall back to SF Symbols for icons).
+    public static func resourceBundleURL(bundleName: String, candidateDirs: [URL]) -> URL? {
+        for dir in candidateDirs {
+            let url = dir.appendingPathComponent(bundleName + ".bundle", isDirectory: true)
+            var isDirectory: ObjCBool = false
+            let exists = FileManager.default.fileExists(atPath: url.path, isDirectory: &isDirectory)
+            if exists, isDirectory.boolValue {
+                return url
+            }
+        }
+        return nil
+    }
+
     // MARK: - Child process environment
 
     /// PATH handed to `timber` children. GUI apps launch with a minimal
diff --git a/Tests/TimberModelTests/TimberModelTests.swift b/Tests/TimberModelTests/TimberModelTests.swift
index 11a083b..dc318d6 100644
--- a/Tests/TimberModelTests/TimberModelTests.swift
+++ b/Tests/TimberModelTests/TimberModelTests.swift
@@ -162,6 +162,67 @@ final class TimberModelTests: XCTestCase {
         )
     }
 
+    // MARK: - resource bundle lookup
+
+    /// Fixture mirroring the v0.1.1 installed layout: a flat
+    /// `<name>.bundle` directory (PNGs at top level, no Info.plist)
+    /// that the synthesized Bundle.module failed to resolve, trapping
+    /// the popover on first open. The defensive lookup must find it.
+    func testResourceBundleURLFindsFlatBundle() throws {
+        let root = FileManager.default.temporaryDirectory
+            .appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let bundle = root.appendingPathComponent("Timber_Timber.bundle", isDirectory: true)
+        try FileManager.default.createDirectory(at: bundle, withIntermediateDirectories: true)
+        FileManager.default.createFile(atPath: bundle.appendingPathComponent("zed.png").path, contents: Data())
+        addTeardownBlock { try? FileManager.default.removeItem(at: root) }
+
+        let found = TimberModel.resourceBundleURL(bundleName: "Timber_Timber", candidateDirs: [root])
+        XCTAssertEqual(found, bundle)
+        // And plain Foundation resolution works on what we found.
+        let loaded = found.flatMap(Bundle.init(url:))
+        XCTAssertNotNil(loaded?.url(forResource: "zed", withExtension: "png"))
+    }
+
+    func testResourceBundleURLFindsStructuredBundle() throws {
+        let root = FileManager.default.temporaryDirectory
+            .appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let resources = root.appendingPathComponent("Timber_Timber.bundle/Contents/Resources", isDirectory: true)
+        try FileManager.default.createDirectory(at: resources, withIntermediateDirectories: true)
+        FileManager.default.createFile(atPath: resources.appendingPathComponent("zed.png").path, contents: Data())
+        addTeardownBlock { try? FileManager.default.removeItem(at: root) }
+
+        let found = TimberModel.resourceBundleURL(bundleName: "Timber_Timber", candidateDirs: [root])
+        XCTAssertNotNil(found)
+        XCTAssertNotNil(found.flatMap(Bundle.init(url:))?.url(forResource: "zed", withExtension: "png"))
+    }
+
+    func testResourceBundleURLReturnsNilWhenMissing() {
+        let missing = FileManager.default.temporaryDirectory
+            .appendingPathComponent(UUID().uuidString, isDirectory: true)
+        XCTAssertNil(TimberModel.resourceBundleURL(bundleName: "Timber_Timber", candidateDirs: [missing]))
+        XCTAssertNil(TimberModel.resourceBundleURL(bundleName: "Timber_Timber", candidateDirs: []))
+    }
+
+    func testResourceBundleURLPrefersFirstMatch() throws {
+        let first = FileManager.default.temporaryDirectory
+            .appendingPathComponent(UUID().uuidString, isDirectory: true)
+        let second = FileManager.default.temporaryDirectory
+            .appendingPathComponent(UUID().uuidString, isDirectory: true)
+        for root in [first, second] {
+            try FileManager.default.createDirectory(
+                at: root.appendingPathComponent("Timber_Timber.bundle", isDirectory: true),
+                withIntermediateDirectories: true
+            )
+        }
+        addTeardownBlock {
+            try? FileManager.default.removeItem(at: first)
+            try? FileManager.default.removeItem(at: second)
+        }
+
+        let found = TimberModel.resourceBundleURL(bundleName: "Timber_Timber", candidateDirs: [first, second])
+        XCTAssertEqual(found?.deletingLastPathComponent(), first)
+    }
+
     // MARK: - child PATH
 
     func testChildPATHPrependsMissingDirs() {