chore(deps): bump @pierre/diffs to 1.3.1 with @pierre/theme 2.0.0 and @pierre/theming 1.0.0 (#1190)

Retune buildLineBgOverrides for the 1.3.x hover pipeline: per-selector
hover mix rules are gone; hover is now one central rule mixing the
active-line bg 97% (light) / 91% (dark) toward --diffs-hover-mix-target.
Emitted hover --mix-* values are divided by those factors so the final
rendered hover bg shares match 1.2.12 exactly at normal and strong, and
subtle pins the 1.2.x hover finals (deletion 80/75, addition 80/70).

Also add @pierre/theme and @pierre/theming to the bunfig minimumReleaseAge
excludes (review follow-up from #1188).

package.json

@@ -39,7 +39,7 @@
   "dependencies": {
     "@anthropic-ai/claude-agent-sdk": "^0.2.92",
     "@opencode-ai/sdk": "^1.3.0",
-    "@pierre/diffs": "1.2.12",
+    "@pierre/diffs": "1.3.1",
     "diff": "^8.0.4",
     "dockview-react": "^5.2.0",
     "dompurify": "^3.3.3",