chore(deps): bump @pierre/diffs to 1.2.12 (stage 1 of 2) (#1188)

Bump the exact pin from 1.2.8 to 1.2.12 in all six package.json files
(root, packages/ui, packages/server, packages/review-editor,
apps/review, apps/pi-extension) and resolve the lockfile.

1.2.12 pulls in @pierre/theme 1.1.0 (minor, transitive-only; we have no
direct theme dependency) and a new transitive @pierre/theming 0.0.2.
Stage 2 (1.3.x, next week once aged) carries the theme major and the
hover pipeline rework.

Verified: typecheck, full bun test, CI DOM set, all four builds, SSR
parity at 1.2.8 vs 1.2.12 (structure identical except the intentional
tabindex removal from the 1.2.12 focus fix), and a fresh registry
install of the pi-extension tarball resolving a working 1.2.12
(guarding against the 1.2.9-era broken-tarball failure mode, #880).

Author: backnotprop

apps/pi-extension/package.json

@@ -52,7 +52,7 @@
   },
   "dependencies": {
     "@joplin/turndown-plugin-gfm": "^1.0.64",
-    "@pierre/diffs": "1.2.8",
+    "@pierre/diffs": "1.2.12",
     "@plannotator/webtui": "0.1.0",
     "chokidar": "^5.0.0",
     "diff": "^8.0.4",

apps/review/package.json

@@ -12,7 +12,7 @@
     "@plannotator/review-editor": "workspace:*",
     "@plannotator/server": "workspace:*",
     "@plannotator/ui": "workspace:*",
-    "@pierre/diffs": "1.2.8",
+    "@pierre/diffs": "1.2.12",
     "dompurify": "^3.3.3",
     "react": "^19.2.3",
     "react-dom": "^19.2.3",

bun.lock

@@ -39,7 +39,7 @@
   "dependencies": {
     "@anthropic-ai/claude-agent-sdk": "^0.2.92",
     "@opencode-ai/sdk": "^1.3.0",
-    "@pierre/diffs": "1.2.8",
+    "@pierre/diffs": "1.2.12",
     "diff": "^8.0.4",
     "dockview-react": "^5.2.0",
     "dompurify": "^3.3.3",

package.json

@@ -12,7 +12,7 @@
     "@base-ui/react": "^1.6.0",
     "@fontsource-variable/geist-mono": "5.2.7",
     "@fontsource-variable/inter": "^5.2.8",
-    "@pierre/diffs": "1.2.8",
+    "@pierre/diffs": "1.2.12",
     "@plannotator/shared": "workspace:*",
     "@plannotator/ui": "workspace:*",
     "highlight.js": "^11.11.1",

packages/review-editor/package.json

@@ -31,7 +31,7 @@
     "*.mjs"
   ],
   "dependencies": {
-    "@pierre/diffs": "1.2.8",
+    "@pierre/diffs": "1.2.12",
     "@plannotator/ai": "workspace:*",
     "@plannotator/shared": "workspace:*",
     "@plannotator/webtui": "0.1.0",

packages/server/package.json

@@ -66,7 +66,7 @@
     "@fontsource-variable/inter": "^5.2.8",
     "@lezer/common": "^1.5.2",
     "@lezer/highlight": "^1.2.3",
-    "@pierre/diffs": "1.2.8",
+    "@pierre/diffs": "1.2.12",
     "@plannotator/atomic-editor": "^0.8.0",
     "@plannotator/core": "workspace:*",
     "@plannotator/markdown-editor": "^0.4.0",