Complete all translations to 100% and fix auto-extraction

- Mark non-localizable strings with Text(verbatim:) to prevent extraction
- Update UI strings to lowercase per style guide (open, save, close, recording)
- Add complete translations for all 29 languages (194/194 strings at 100%)
- Remove empty/duplicate entries (@, bitchat/, Open, Recording %@)
- Add proper localization comments for all user-facing strings

bitchat/Views/ContentView.swift

@@ -1880,7 +1880,7 @@ private extension ContentView {
             Image(systemName: "waveform.circle.fill")
                 .foregroundColor(.red)
                 .font(.bitchatSystem(size: 20))
-            Text("Recording \(formattedRecordingDuration())")
+            Text("recording \(formattedRecordingDuration())", comment: "Voice note recording duration indicator")
                 .font(.bitchatSystem(size: 13, design: .monospaced))
                 .foregroundColor(.red)
             Spacer()
@@ -2310,7 +2310,7 @@ struct ImagePreviewView: View {
                 Spacer()
                 HStack {
                     Button(action: { dismiss() }) {
-                        Text("close")
+                        Text("close", comment: "Button to dismiss fullscreen media viewer")
                             .font(.bitchatSystem(size: 15, weight: .semibold))
                             .foregroundColor(.white)
                             .padding(.horizontal, 16)
@@ -2319,7 +2319,7 @@ struct ImagePreviewView: View {
                     }
                     Spacer()
                     Button(action: saveCopy) {
-                        Text("save")
+                        Text("save", comment: "Button to save media to device")
                             .font(.bitchatSystem(size: 15, weight: .semibold))
                             .foregroundColor(.white)
                             .padding(.horizontal, 16)

bitchat/Views/Media/FileAttachmentView.swift

@@ -52,7 +52,7 @@ struct FileAttachmentView: View {
             Spacer()
 
             Button(action: openFile) {
-                Text("Open")
+                Text("open", comment: "Button to open attached file")
                     .font(.bitchatSystem(size: 13, weight: .semibold))
                     .padding(.horizontal, 12)
                     .padding(.vertical, 6)