feat(profiles): rename any agent — the default profile gets a display name (#45624)

`hermes profile rename default <name>` (and the Desktop/dashboard rename
flows) now set a presentation-only `display_name` in profile.yaml instead
of erroring. The canonical id stays "default"; resolution, comparison,
and spawn paths are untouched. Named profiles keep real renames and their
display_name survives the move.

Surfaces: profile list/show/status, /profile (text only — data.profile
stays canonical), dashboard ProfilesPage, TUI-gateway profiles.list, and
Desktop (rail, switcher, Manage page, and the Bot Mode roster via a
displayName fallback so a renamed default shows its name, not "default").

Slimmer redo of the direction in PR #87760 by @yxssxn — thanks; see PR
body for what changed vs that approach.

hermes_cli/slash_exec.py

@@ -100,8 +100,23 @@ def _exec_profile(ctx: CommandContext) -> CommandReply:
 
         home_display = display_hermes_home()
 
+    # Presentation-only display name (profile.yaml). `data.profile` stays
+    # the canonical id — consumers route on it; only the text gets the label.
+    label = profile_name
+    try:
+        from hermes_cli.profiles import (
+            format_profile_label,
+            get_profile_dir,
+            read_profile_meta,
+        )
+
+        display = read_profile_meta(get_profile_dir(profile_name)).get("display_name", "")
+        label = format_profile_label(profile_name, display)
+    except Exception:
+        pass
+
     return CommandReply(
-        f"Profile: {profile_name}\nHome: {home_display}",
+        f"Profile: {label}\nHome: {home_display}",
         data={"profile": profile_name, "home": home_display},
     )