docs(theme): mark themeissues #6 resolved in 0.3.1

Interactive-render nav fix (CSS display:none-when-closed + nav-state.js
MutationObserver re-wire) shipped in 0.3.1 and verified — ScadaBridge Central UI
NavCollapseTests now pass. All six issues now resolved (5 fixed, 1 tradeoff).

ZB.MOM.WW.Theme/themeissues.md

@@ -10,6 +10,11 @@ All file references below point at the kit source under `src/ZB.MOM.WW.Theme/`.
 > **RESOLVED in kit 0.3.0 (2026-06-05).** Issues 1, 2, 3, and 5 are fixed in the kit and
 > redistributed; Issue 4 is an accepted, documented tradeoff (no code change). See
 > [Resolution](#resolution-kit-030) below for what changed and why.
+>
+> **RESOLVED in kit 0.3.1 (2026-06-05).** Issue 6 (collapsible nav non-functional under
+> interactive Blazor render) is fixed — CSS `display:none`-when-closed backstop +
+> `MutationObserver` re-wire in `nav-state.js`. See the [Issue 6](#issue-6--collapsible-nav-is-non-functional-under-interactive-blazor-render-mode)
+> resolution note. All six issues are now resolved (5 fixed, 1 accepted tradeoff).
 
 ## Summary
 
@@ -20,7 +25,7 @@ All file references below point at the kit source under `src/ZB.MOM.WW.Theme/`.
 | 3 | Medium | `nav-state.js` | Persistence wires once on `DOMContentLoaded`; not re-applied after Blazor enhanced navigation / dynamic re-render. | ✅ Fixed |
 | 4 | Low | `NavRailSection` | Always-expanded SSR default causes a flash / layout shift of collapsed sections on load. | 📄 Accepted tradeoff (documented) |
 | 5 | Low (optional) | `LoginCard` | Heading bakes the localizable `— sign in` suffix into the product title with no separate hook. | ✅ Fixed |
-| 6 | High | `NavRailSection` / `nav-state.js` | Under **interactive** Blazor render mode the whole collapsible nav is non-functional: clicking a header doesn't hide items, and `nav-state.js` never wires (no aria sync, no persistence, no active-reveal). | ❌ Open (found in 0.3.0) |
+| 6 | High | `NavRailSection` / `nav-state.js` | Under **interactive** Blazor render mode the whole collapsible nav is non-functional: clicking a header doesn't hide items, and `nav-state.js` never wires (no aria sync, no persistence, no active-reveal). | ✅ Fixed (0.3.1) |
 
 ---
 
@@ -234,7 +239,22 @@ or add an optional `Heading` parameter that, when set, replaces the default head
 ## Issue 6 — Collapsible nav is non-functional under interactive Blazor render mode
 
 **Severity:** High · **Files:** `Components/NavRailSection.razor`, `wwwroot/js/nav-state.js`,
-`wwwroot/css/layout.css` · **Status:** Open (found in 0.3.0)
+`wwwroot/css/layout.css` · **Status:** ✅ Fixed in 0.3.1
+
+> **Resolution (kit 0.3.1, 2026-06-05).** Both recommended parts shipped, so the collapsible
+> nav now works under interactive render modes as well as static SSR:
+> 1. **CSS robust collapse** — `layout.css` hides the body explicitly when closed instead of
+>    relying on the native `::details-content` content-hiding (which an interactive framework
+>    desyncs): `.rail-section:not([open]) > .rail-section-body { display: none; }`.
+> 2. **Render-mode-agnostic re-wire** — `nav-state.js` adds a `MutationObserver` on
+>    `document.documentElement` (childList + subtree) that re-runs `apply()` whenever
+>    `details.rail-section` nodes are added/replaced, so the interactive runtime's re-render
+>    gets wired (aria sync, `data-zbnav-initialized`, localStorage persistence, active-reveal).
+>    The existing `enhancedload` hook (Issue 3) is kept for static-SSR enhanced navigation.
+>
+> Verified live in ScadaBridge Central UI (global `@rendermode InteractiveServer`): the
+> Playwright `NavCollapseTests` (toggle-hides-items, persistence-survives-reload,
+> deep-link-auto-reveal) now pass against 0.3.1.
 
 > **This corrects Issue 3's note**, which claimed interactive Blazor Server consumers are
 > "largely unaffected because the rail is patched in place." Direct observation of the live
@@ -311,9 +331,11 @@ silently does nothing.
 summary's `aria-expanded` flips; `localStorage` gets a `zbnav:<key>` entry; the state survives
 a reload; and deep-linking into a collapsed section reveals it.
 
-**Consumer note (ScadaBridge).** Until the kit ships this, ScadaBridge's Central UI nav
-collapse is a no-op; the Playwright `NavCollapseTests` that exercise toggling, persistence, and
-auto-reveal are therefore testing behavior the app does not currently have.
+**Consumer note (ScadaBridge).** Resolved on 0.3.1: ScadaBridge's Central UI consumes
+`ZB.MOM.WW.Theme` 0.3.1, and the Playwright `NavCollapseTests` (toggling, persistence,
+auto-reveal) now pass — the `NavCollapseWiredAsync` gate (which waits for
+`data-zbnav-initialized` on every `details.rail-section`) is satisfied under interactive
+render, so those tests run unskipped and green.
 
 ---