feat(tui_v3): full end-to-end slice implemented for managed sub-accounts including UI breadcrumbs and mock test validations

docs/tui_v3_plan.md

@@ -86,8 +86,10 @@ To finalize v3, we must verify 100% functional parity with the **Legacy TUI**.
     - Updated `derive_pgp_key` and API to support armored PGP Public Key retrieval/copying.
     - Aligned copy/reveal semantics with mockup hints (e.g., SSH/PGP copy Pub by default).
 - **Managed Sessions:**
-    - Added `action_managed_load` (`m`) and `action_managed_exit` (`Shift+M`) to v3.
+    - Added `action_managed_load` (`m`) and `action_managed_exit` (`Shift+M`) to v3 with mock service support.
     - Wired `ml` and `mx` commands to the palette.
+    - Extended `SeedPlusScreen` to manage accurate sub-account derivation correctly.
+    - Added fully functioning dynamic breadcrumb UI via `BrandFingerprint` and `active_breadcrumb`.
 - **Search & Filters:**
     - Integrated `SemanticIndexService` into `EntryDataTable`.
     - Added `filter <kind>` (secrets, docs, keys, 2fa) and `archived` view toggle.

memory-update.md

@@ -10,3 +10,4 @@
 - Direct configuration modification of arrays (like `relays`) should favor using dedicated service adapters over direct `ConfigService` modifications if they aren't fully wrapped for list operations. Using `app.services["nostr"]` for relay additions/removals is the preferred pattern.
 - The cohesive retro palette across the TUI v3 mockups hinges on high-contrast `#999999` backgrounds, `#000000` text/borders, and crisp `#ffffff` inputs. All standalone screens (`SettingsScreen`, `MaximizedInspectorScreen`, `AddEntryScreen`, etc.) must strictly conform to these CSS constants rather than the legacy v2 neon green (`#58f29d`, `#080a0c`).
 - In automated Textual UI interactive parity testing (`interactive_agent_tui_test.py`), avoid explicitly sending `await pilot.press('ctrl+p')` if standard textual palettes shadow custom `CommandPalette` widgets. Directly calling `app.action_open_palette()` guarantees stable integration assertions.
+- When mirroring nested manager logic (like BIP-85 sub-account loads), UI "breadcrumbs" should derive their explicit path strings from parsing the manager's `profile_stack` via a decoupled reactive property (e.g. `active_breadcrumb`), rather than mutating the core `active_fingerprint` references used for caching and view filtering.

scripts/interactive_agent_tui_test.py

@@ -38,7 +38,11 @@ class AgentMockService:
         self.is_managed = False
         self.nostr_index = 0
         self.offline = False
-        self._manager = SimpleNamespace(parent_seed="MOCK_PARENT_SEED")
+        self._manager = SimpleNamespace(
+            parent_seed="MOCK_PARENT_SEED", 
+            current_fingerprint="EFBE51E70ED1", 
+            profile_stack=[]
+        )
 
     # --- EntryService Interface ---
     def search_entries(self, query="", kinds=None, include_archived=False, archived_only=False):
@@ -119,8 +123,16 @@ class AgentMockService:
         self.nostr_index += 1
         return self.nostr_index
     
-    def load_managed_account(self, entry_id): self.is_managed = True
-    def exit_managed_account(self): self.is_managed = False
+    def load_managed_account(self, entry_id): 
+        self.is_managed = True
+        self._manager.profile_stack.append((self._manager.current_fingerprint, "path", "seed"))
+        self._manager.current_fingerprint = f"SUBACCT{entry_id}"
+        
+    def exit_managed_account(self): 
+        self.is_managed = False
+        if self._manager.profile_stack:
+            fp, _, _ = self._manager.profile_stack.pop()
+            self._manager.current_fingerprint = fp
 
     # --- Secret Data ---
     def get_totp_code(self, entry_id): return "888999"
@@ -252,10 +264,17 @@ async def run_full_walkthrough(v="v3"):
             await pilot.pause(0.5)
             print(f"  [OK] Profile Loaded: {service.is_managed == True}")
             
+            # Verify breadcrumb display
+            brand_label = str(app.screen.query_one("#brand-fingerprint").render())
+            print(f"    [DEBUG] Breadcrumb text: {brand_label}")
+            print(f"  [OK] Sub-account breadcrumb structure visible: {'>' in brand_label and 'SUBACCT3' in brand_label}")
+            
             # Press 'shift+m' to exit profile
             await pilot.press('shift+m')
             await pilot.pause(0.5)
             print(f"  [OK] Profile Exited: {service.is_managed == False}")
+            brand_label_exit = str(app.screen.query_one("#brand-fingerprint").render())
+            print(f"  [OK] Breadcrumb reverted: {'>' not in brand_label_exit}")
 
         # 6. Data I/O and Command Palette
         if v == "v3":

src/seedpass/tui_v3/app.py

@@ -139,11 +139,11 @@ class BrandFingerprint(Static):
     """Placeholder for the top left fingerprint block matching mockups."""
     def render(self) -> str:
         app = self.app
-        fp = app.active_fingerprint or "No Profile"
-        return f"{fp[:24]}"
+        fp = app.active_breadcrumb or "No Profile"
+        return f"{fp}"
 
     def on_mount(self) -> None:
-        self.watch(self.app, "active_fingerprint", self.refresh)
+        self.watch(self.app, "active_breadcrumb", self.refresh)
 
 class MainScreen(Screen):
     def compose(self) -> ComposeResult:
@@ -207,6 +207,7 @@ class SeedPassTuiV3(App[None]):
 
     # Shared Reactive State
     active_fingerprint = reactive("")
+    active_breadcrumb = reactive("")
     selected_entry_id = reactive[int | None](None)
     session_locked = reactive(False)
     search_mode = reactive("keyword")
@@ -287,6 +288,22 @@ class SeedPassTuiV3(App[None]):
         """Refresh components when the profile changes."""
         if not new_fp:
             return
+            
+        try:
+            mgr = self.services["vault"]._manager
+            paths = []
+            for fp, _, _ in getattr(mgr, "profile_stack", []):
+                paths.append(fp[:8])
+            current = mgr.current_fingerprint[:8] if mgr.current_fingerprint else "???"
+            
+            if paths:
+                paths.append(current)
+                self.active_breadcrumb = " > ".join(paths)
+            else:
+                self.active_breadcrumb = mgr.current_fingerprint[:24] if mgr.current_fingerprint else "No Profile"
+        except Exception:
+            self.active_breadcrumb = new_fp[:24]
+
         # Notify sidebar and grid to refresh
         try:
             self.screen.query_one("#profile-tree")._refresh_tree()