fix(canvas): add focus-visible rings across 6 more files

WCAG 2.4.7 — Focus Visible.

PricingTable: CTA button now has focus-visible ring.
MissingKeysModal: Save, Open Settings, Cancel Deploy, Deploy buttons.
FilesToolbar: New, Upload, Export, Clear, Refresh buttons.
FileTreeContextMenu: menuitem buttons — replaced focus:bg with
  focus-visible:ring-2 (proper keyboard-only visible ring).
AgentCommsPanel: Restart and Open peer buttons.
settings-panel.css: secret-row cancel/save, add-key-form cancel/save
  all gain focus-visible ring.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

canvas/src/components/MissingKeysModal.tsx

@@ -706,7 +706,7 @@ function AllKeysModal({
                     type="button"
                     onClick={() => handleSaveKey(index)}
                     disabled={!entry.value.trim() || entry.saving}
-                    className="px-3 py-1.5 bg-accent-strong hover:bg-accent text-[11px] rounded text-white disabled:opacity-30 transition-colors shrink-0"
+                    className="px-3 py-1.5 bg-accent-strong hover:bg-accent text-[11px] rounded text-white disabled:opacity-30 transition-colors shrink-0 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
                   >
                     {entry.saving ? "..." : "Save"}
                   </button>
@@ -730,7 +730,7 @@ function AllKeysModal({
               <button
                 type="button"
                 onClick={onOpenSettings}
-                className="text-[11px] text-accent hover:text-accent transition-colors"
+                className="text-[11px] text-accent hover:text-accent transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
               >
                 Open Settings Panel
               </button>
@@ -740,7 +740,7 @@ function AllKeysModal({
             <button
               type="button"
               onClick={onCancel}
-              className="px-3.5 py-1.5 text-[12px] text-ink-mid hover:text-ink bg-surface-card hover:bg-surface-card border border-line rounded-lg transition-colors"
+              className="px-3.5 py-1.5 text-[12px] text-ink-mid hover:text-ink bg-surface-card hover:bg-surface-card border border-line rounded-lg transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             >
               Cancel Deploy
             </button>
@@ -748,7 +748,7 @@ function AllKeysModal({
               type="button"
               onClick={handleAddKeysAndDeploy}
               disabled={!allSaved || anySaving}
-              className="px-3.5 py-1.5 text-[12px] bg-accent-strong hover:bg-accent text-white rounded-lg transition-colors disabled:opacity-40"
+              className="px-3.5 py-1.5 text-[12px] bg-accent-strong hover:bg-accent text-white rounded-lg transition-colors disabled:opacity-40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             >
               {anySaving ? "Saving..." : allSaved ? "Deploy" : "Add Keys"}
             </button>

canvas/src/components/PricingTable.tsx

@@ -128,7 +128,7 @@ function PlanCard({
         type="button"
         onClick={onSelect}
         disabled={loading}
-        className={`mt-6 rounded-lg px-4 py-3 text-sm font-medium ${
+        className={`mt-6 rounded-lg px-4 py-3 text-sm font-medium focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-2 focus-visible:ring-offset-surface ${
           plan.highlighted
             ? "bg-accent-strong text-white hover:bg-accent disabled:bg-zinc-700 disabled:text-zinc-500"
             : "border border-line bg-surface-sunken text-ink hover:bg-surface-card disabled:opacity-50"

canvas/src/components/tabs/FilesTab/FileTreeContextMenu.tsx

@@ -128,8 +128,8 @@ export function FileTreeContextMenu({ x, y, items, onClose }: Props) {
           }}
           className={
             item.destructive
-              ? "w-full text-left px-3 py-1 text-bad hover:bg-red-900/30 focus:bg-red-900/30 focus:outline-none disabled:opacity-40 disabled:pointer-events-none transition-colors"
-              : "w-full text-left px-3 py-1 text-ink-mid hover:bg-surface-card hover:text-ink focus:bg-surface-card focus:text-ink focus:outline-none disabled:opacity-40 disabled:pointer-events-none transition-colors"
+              ? "w-full text-left px-3 py-1 text-bad hover:bg-red-900/30 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-red-500 focus-visible:ring-offset-1 disabled:opacity-40 disabled:pointer-events-none transition-colors"
+              : "w-full text-left px-3 py-1 text-ink-mid hover:bg-surface-card hover:text-ink focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1 disabled:opacity-40 disabled:pointer-events-none transition-colors"
           }
         >
           {item.icon && <span className="inline-block w-4 mr-1.5 text-ink-mid">{item.icon}</span>}

canvas/src/components/tabs/FilesTab/FilesToolbar.tsx

@@ -44,7 +44,7 @@ export function FilesToolbar({
       <div className="flex gap-1.5">
         {root === "/configs" && (
           <>
-            <button type="button" onClick={onNewFile} aria-label="Create new file" className="text-[10px] text-accent hover:text-accent" title="Create new file">
+            <button type="button" onClick={onNewFile} aria-label="Create new file" className="text-[10px] text-accent hover:text-accent focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1" title="Create new file">
               + New
             </button>
             <input
@@ -57,20 +57,20 @@ export function FilesToolbar({
               className="hidden"
               onChange={(e) => e.target.files && onUpload(e.target.files)}
             />
-            <button type="button" onClick={() => uploadRef.current?.click()} aria-label="Upload folder" className="text-[10px] text-accent hover:text-accent" title="Upload folder">
+            <button type="button" onClick={() => uploadRef.current?.click()} aria-label="Upload folder" className="text-[10px] text-accent hover:text-accent focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1" title="Upload folder">
               Upload
             </button>
           </>
         )}
-        <button type="button" onClick={onDownloadAll} aria-label="Download all files" className="text-[10px] text-ink-mid hover:text-ink-mid" title="Download all files">
+        <button type="button" onClick={onDownloadAll} aria-label="Download all files" className="text-[10px] text-ink-mid hover:text-ink-mid focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1" title="Download all files">
           Export
         </button>
         {root === "/configs" && (
-          <button type="button" onClick={onClearAll} aria-label="Delete all files" className="text-[10px] text-bad/60 hover:text-bad" title="Delete all files">
+          <button type="button" onClick={onClearAll} aria-label="Delete all files" className="text-[10px] text-bad/60 hover:text-bad focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-red-500 focus-visible:ring-offset-1" title="Delete all files">
             Clear
           </button>
         )}
-        <button type="button" onClick={onRefresh} aria-label="Refresh file list" className="text-[10px] text-ink-mid hover:text-ink-mid" title="Refresh">
+        <button type="button" onClick={onRefresh} aria-label="Refresh file list" className="text-[10px] text-ink-mid hover:text-ink-mid focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1" title="Refresh">
           ↻
         </button>
       </div>

canvas/src/components/tabs/chat/AgentCommsPanel.tsx

@@ -827,14 +827,14 @@ function ErrorMessage({ msg }: { msg: CommMessage }) {
               type="button"
               onClick={handleRestart}
               disabled={restarting}
-              className="px-2 py-0.5 rounded bg-red-900/50 hover:bg-red-800/60 border border-red-700/40 text-[10px] text-red-200 disabled:opacity-50 transition-colors"
+              className="px-2 py-0.5 rounded bg-red-900/50 hover:bg-red-800/60 border border-red-700/40 text-[10px] text-red-200 disabled:opacity-50 transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-red-500 focus-visible:ring-offset-1"
             >
               {restarting ? "Restarting…" : `Restart ${msg.peerName}`}
             </button>
             <button
               type="button"
               onClick={handleOpen}
-              className="px-2 py-0.5 rounded bg-surface-card hover:bg-surface-card border border-line/50 text-[10px] text-ink-mid transition-colors"
+              className="px-2 py-0.5 rounded bg-surface-card hover:bg-surface-card border border-line/50 text-[10px] text-ink-mid transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-1"
             >
               Open {msg.peerName}
             </button>

canvas/src/styles/settings-panel.css

@@ -276,6 +276,11 @@
   cursor: pointer;
 }
 
+.secret-row__cancel-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 .secret-row__save-btn {
   background: #2563eb;
   color: #ffffff;
@@ -286,6 +291,11 @@
   cursor: pointer;
 }
 
+.secret-row__save-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 .secret-row__save-btn:disabled { opacity: 0.4; cursor: not-allowed; }
 
 /* ── Add key form ──────────────────────────────────── */
@@ -354,6 +364,11 @@
   cursor: pointer;
 }
 
+.add-key-form__cancel-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 .add-key-form__save-btn {
   background: #2563eb;
   color: #ffffff;
@@ -364,6 +379,11 @@
   cursor: pointer;
 }
 
+.add-key-form__save-btn:focus-visible {
+  outline: var(--focus-ring);
+  outline-offset: var(--focus-ring-offset);
+}
+
 .add-key-form__save-btn:disabled { opacity: 0.4; cursor: not-allowed; }
 
 .secrets-tab__add-btn {