CAMEL-23720: Centralize remaining TUI glyphs through TuiIcons

Migrate raw emoji literals that lived in popup/browser classes to the
TuiIcons registry, completing the single-source-of-truth goal:

- ExampleBrowserPopup: bundled/online/Docker/infra/Citrus icons and legend
- InfraBrowserPopup: infra service row prefix
- FolderBrowser: directory icon
- DoctorPopup: MCP connection check now uses TuiIcons.MCP instead of
  reusing TuiIcons.OTEL (which stays for OTel Spans)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ammachado

dsl/camel-jbang/camel-jbang-plugin-tui/src/main/java/org/apache/camel/dsl/jbang/core/commands/tui/DoctorPopup.java

@@ -310,13 +310,13 @@ private void checkMcpConnection(List<Line> result) {
             String client = mcpConnectedClient != null ? mcpConnectedClient.get() : null;
             if (client != null) {
                 result.add(Line.from(
-                        Span.raw(TuiIcons.indent(TuiIcons.OTEL)),
+                        Span.raw(TuiIcons.indent(TuiIcons.MCP)),
                         Span.styled(String.format("%-14s", "MCP"), Style.EMPTY.bold()),
                         Span.raw(String.format("%-30s", client + " (port " + mcpPort + ")")),
                         Span.raw(" " + TuiIcons.OK)));
             } else {
                 result.add(Line.from(
-                        Span.raw(TuiIcons.indent(TuiIcons.OTEL)),
+                        Span.raw(TuiIcons.indent(TuiIcons.MCP)),
                         Span.styled(String.format("%-14s", "MCP"), Style.EMPTY.bold()),
                         Span.raw(String.format("%-30s", "Listening on port " + mcpPort)),
                         Span.raw(" " + TuiIcons.WARN)));
@@ -325,7 +325,7 @@ private void checkMcpConnection(List<Line> result) {
             }
         } else {
             result.add(Line.from(
-                    Span.raw(TuiIcons.indent(TuiIcons.OTEL)),
+                    Span.raw(TuiIcons.indent(TuiIcons.MCP)),
                     Span.styled(String.format("%-14s", "MCP"), Style.EMPTY.bold()),
                     Span.raw(String.format("%-30s", "Not enabled")),
                     Span.raw(" " + TuiIcons.WARN)));

dsl/camel-jbang/camel-jbang-plugin-tui/src/main/java/org/apache/camel/dsl/jbang/core/commands/tui/ExampleBrowserPopup.java

@@ -404,8 +404,8 @@ private List<ListItem> buildListItems(int width) {
             boolean citrus = ExampleHelper.hasCitrusTests(ex);
             boolean infra = !ExampleHelper.getInfraServices(ex).isEmpty();
 
-            String icons = (bundled ? "📦" : "🌐") + (docker ? "🐳" : "  ")
-                           + (infra ? "🔧" : "  ") + (citrus ? "🍋" : "  ");
+            String icons = (bundled ? TuiIcons.BUNDLED : TuiIcons.ONLINE) + (docker ? TuiIcons.DOCKER : "  ")
+                           + (infra ? TuiIcons.INFRA : "  ") + (citrus ? TuiIcons.CITRUS : "  ");
             int nameCol = Math.min(30, width / 3);
             String padded = String.format("%-" + nameCol + "s", TuiHelper.truncate(name, nameCol));
             String prefix = " " + icons + " " + padded + " ";
@@ -426,7 +426,9 @@ private List<ListItem> buildListItems(int width) {
             }
         }
         items.add(ListItem.from(""));
-        items.add(ListItem.from(" 📦 = bundled  🌐 = online  🐳 = Docker  🔧 = infra services  🍋 = Citrus tests")
+        items.add(ListItem.from(" " + TuiIcons.BUNDLED + " = bundled  " + TuiIcons.ONLINE + " = online  "
+                                + TuiIcons.DOCKER + " = Docker  " + TuiIcons.INFRA + " = infra services  " + TuiIcons.CITRUS
+                                + " = Citrus tests")
                 .style(Style.EMPTY.dim()));
         return items;
     }

dsl/camel-jbang/camel-jbang-plugin-tui/src/main/java/org/apache/camel/dsl/jbang/core/commands/tui/FolderBrowser.java

@@ -106,7 +106,7 @@ private boolean loadDirectory(Path dir, String selectName) {
                     .forEach(p -> {
                         String name = p.getFileName().toString();
                         if (Files.isDirectory(p)) {
-                            dirs.add(new DirEntry("📁", name, p.toString(), true));
+                            dirs.add(new DirEntry(TuiIcons.FOLDER, name, p.toString(), true));
                         } else {
                             files.add(new DirEntry(TuiHelper.fileEmoji(p), name, p.toString(), false));
                         }
@@ -120,7 +120,7 @@ private boolean loadDirectory(Path dir, String selectName) {
         List<DirEntry> found = new ArrayList<>();
         Path parent = dir.getParent();
         if (parent != null) {
-            found.add(new DirEntry("📁", "..", parent.toString(), true));
+            found.add(new DirEntry(TuiIcons.FOLDER, "..", parent.toString(), true));
         }
         found.addAll(dirs);
         found.addAll(files);

dsl/camel-jbang/camel-jbang-plugin-tui/src/main/java/org/apache/camel/dsl/jbang/core/commands/tui/InfraBrowserPopup.java

@@ -288,7 +288,7 @@ private void renderBrowser(Frame frame, Rect area) {
         List<ListItem> items = new ArrayList<>();
         for (InfraServiceEntry entry : catalog) {
             String padded = String.format("%-" + nameCol + "s", TuiHelper.truncate(entry.alias(), nameCol));
-            String prefix = "  🔧 " + padded + " ";
+            String prefix = TuiIcons.indent(TuiIcons.INFRA) + padded + " ";
             if (entry.running()) {
                 items.add(ListItem.from(prefix + "(running)").style(Style.EMPTY.dim()));
             } else {