fix: P1 plugin contributions cleanup + P0 inbox workspace picker

Plugin contributions:
- Remove sidebarItems from Activity, Journal (only workspace tabs)
- Remove workspaceItems from Browser Inbox (only sidebar/global)
- Remove workspaceItems from Search (only Ctrl+K command)
- Remove sidebarItems from Platform Test (developer tool, not in sidebar)

Browser Inbox:
- Add workspace picker for captures without workspaceRootPath
- Add assignToWorkspace() with proper storage key migration
- Add loadWorkspacesList() via plugin API
- Add picker CSS styles
- Selections now get same workspace assignment + conversion flow

Fixes P0 issues: captures and selections without workspace assignment
now have clear path to conversion (assign → convert)

plugins/activity/plugin.json

@@ -30,15 +30,7 @@
         "component": "ActivityView"
       }
     ],
-    "sidebarItems": [
-      {
-        "id": "verstak.activity.sidebar",
-        "title": "Activity",
-        "icon": "activity",
-        "view": "verstak.activity.view",
-        "position": 20
-      }
-    ],
+
     "workspaceItems": [
       {
         "id": "verstak.activity.workspace",

plugins/browser-inbox/frontend/src/index.js

@@ -52,6 +52,10 @@
     '.browser-inbox-meta-value{color:#ccc;min-width:0;overflow-wrap:anywhere}',
     '.browser-inbox-text{border:1px solid #24304f;background:#101020;border-radius:6px;padding:.75rem;font-size:.85rem;line-height:1.5;color:#ddd;white-space:pre-wrap;overflow-wrap:anywhere}',
     '.browser-inbox-detail-actions{display:flex;gap:.5rem;flex-wrap:wrap}',
+    '.browser-inbox-picker{display:flex;flex-direction:column;gap:2px;width:100%;border:1px solid #2a3a5e;border-radius:6px;background:#12122a;padding:4px;max-height:240px;overflow:auto}',
+    '.browser-inbox-picker-item{font-size:.78rem;padding:.35rem .65rem;border:none;border-radius:4px;background:transparent;color:#d0d0e0;cursor:pointer;text-align:left}',
+    '.browser-inbox-picker-item:hover{background:#1e2a4a;color:#4ecca3}',
+    '.browser-inbox-picker-empty{font-size:.76rem;color:#8b8ba8;padding:.5rem;text-align:center}',
     '@media(max-width:760px){.browser-inbox-body{grid-template-columns:1fr}.browser-inbox-list{border-right:0;border-bottom:1px solid #16213e;max-height:45vh}.browser-inbox-meta{grid-template-columns:1fr}}'
   ].join('\n');
 
@@ -313,7 +317,9 @@
 
     var scope = scopeFromProps(props || {});
     var captures = [];
-    var selectedId = '';
+    var selectedId = null;
+    var workspacesList = [];
+    var pickerOpen = false;
     var statusText = 'Connecting to receiver events...';
     var statusClass = '';
     var disposed = false;
@@ -665,6 +671,39 @@
             }
           }));
         }
+      } else {
+        actionButtons.push(el('button', {
+          className: 'browser-inbox-btn',
+          'data-browser-inbox-action': 'assign',
+          textContent: 'Assign to Workspace',
+          onClick: function () {
+            pickerOpen = !pickerOpen;
+            render();
+          }
+        }));
+        if (pickerOpen) {
+          var pickerContainer = el('div', { className: 'browser-inbox-picker' });
+          if (workspacesList.length > 0) {
+            workspacesList.forEach(function (ws) {
+              var wsPath = ws.rootPath || ws.name || ws.id || '';
+              pickerContainer.appendChild(el('button', {
+                className: 'browser-inbox-picker-item',
+                textContent: ws.name || ws.title || wsPath,
+                title: wsPath,
+                onClick: function () {
+                  pickerOpen = false;
+                  assignToWorkspace(capture, wsPath);
+                }
+              }));
+            });
+          } else {
+            pickerContainer.appendChild(el('div', {
+              className: 'browser-inbox-picker-empty',
+              textContent: 'No workspaces found. Create a workspace first.'
+            }));
+          }
+          actionButtons.push(pickerContainer);
+        }
       }
       actionButtons.push(el('button', {
           className: 'browser-inbox-btn danger',
@@ -738,7 +777,27 @@
       });
     }
 
+    function loadWorkspacesList() {
+      if (!api || !api.workspaces || typeof api.workspaces.list !== 'function') return Promise.resolve();
+      return api.workspaces.list().then(function (list) {
+        workspacesList = Array.isArray(list) ? list : [];
+      }).catch(function () {
+        workspacesList = [];
+      });
+    }
+
+    function assignToWorkspace(capture, workspacePath) {
+      if (!capture || !workspacePath) return Promise.resolve();
+      capture.workspaceRootPath = workspacePath;
+      capture._storageKey = WORKSPACE_PREFIX + encodeKey(workspacePath);
+      selectedId = capture.captureId;
+      return persist().then(function () {
+        render();
+      });
+    }
+
     render();
+    loadWorkspacesList();
     loadStored().then(function () {
       if (disposed) return;
       render();

plugins/browser-inbox/plugin.json

@@ -39,14 +39,6 @@
         "view": "verstak.browser-inbox.view",
         "position": 30
       }
-    ],
-    "workspaceItems": [
-      {
-        "id": "verstak.browser-inbox.workspace",
-        "title": "Browser Inbox",
-        "icon": "inbox",
-        "component": "BrowserInboxView"
-      }
     ]
   }
 }

plugins/journal/plugin.json

@@ -31,15 +31,7 @@
         "component": "JournalView"
       }
     ],
-    "sidebarItems": [
-      {
-        "id": "verstak.journal.sidebar",
-        "title": "Journal",
-        "icon": "book-open",
-        "view": "verstak.journal.view",
-        "position": 30
-      }
-    ],
+
     "workspaceItems": [
       {
         "id": "verstak.journal.workspace",

plugins/platform-test/plugin.json

@@ -57,15 +57,6 @@
         "handler": "showVersion"
       }
     ],
-    "sidebarItems": [
-      {
-        "id": "verstak.platform-test.sidebar",
-        "title": "Platform Test",
-        "icon": "flask",
-        "view": "verstak.platform-test.diagnostics",
-        "position": 100
-      }
-    ],
     "statusBarItems": [
       {
         "id": "verstak.platform-test.status",

plugins/search/plugin.json

@@ -27,14 +27,6 @@
     "entry": "frontend/src/index.js"
   },
   "contributes": {
-    "workspaceItems": [
-      {
-        "id": "verstak.search.workspace",
-        "title": "Search",
-        "icon": "search",
-        "component": "SearchView"
-      }
-    ],
     "commands": [
       {
         "id": "verstak.search.searchVaultText",