F10 SLICE-1: hide F6 diff command/keybinding + attribution toggle; retitle preview to 'Open Review Preview' (#29)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -86,7 +86,7 @@
       },
       {
         "command": "cowriting.showTrackChangesPreview",
-        "title": "Cowriting: Open Track-Changes Preview",
+        "title": "Cowriting: Open Review Preview",
         "category": "Cowriting"
       }
     ],
@@ -107,6 +107,18 @@
         {
           "command": "cowriting.rejectProposal",
           "when": "false"
+        },
+        {
+          "command": "cowriting.toggleDiffView",
+          "when": "false"
+        },
+        {
+          "command": "cowriting.pinDiffBaseline",
+          "when": "false"
+        },
+        {
+          "command": "cowriting.toggleAttribution",
+          "when": "false"
         }
       ],
       "editor/context": [
@@ -138,16 +150,6 @@
           "command": "cowriting.reopenThread",
           "group": "inline",
           "when": "commentController == cowriting.threads && commentThread =~ /^resolved$/"
-        },
-        {
-          "command": "cowriting.acceptProposal",
-          "group": "inline@1",
-          "when": "commentController == cowriting.proposals && commentThread =~ /^pending$/"
-        },
-        {
-          "command": "cowriting.rejectProposal",
-          "group": "inline@2",
-          "when": "commentController == cowriting.proposals"
         }
       ]
     },
@@ -155,7 +157,7 @@
       {
         "command": "cowriting.toggleDiffView",
         "key": "ctrl+alt+d",
-        "when": "editorTextFocus"
+        "when": "false"
       },
       {
         "command": "cowriting.showTrackChangesPreview",