docs: add release notes for v2026-05-12

release-notes/v2026-05-12.md

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+## New Features
+
+- 🧮 **Math Blocks from Slash Commands** — Insert math expressions directly from the editor slash menu.
+- 🗓️ **Flexible Date Display** — Choose how dates appear across note lists, properties, and inspector views.
+- 🧭 **Mounted Workspaces** — Bring separate vault workspaces into Tolaria while keeping their Git boundaries intact.
+- 📂 **Collapsed Sidebar Reopen Button** — Reopen the sidebar more easily after switching to a focused writing layout.
+
+## Improvements
+
+- 🖼️ **Better Media and Embed Handling** — Note-relative images, multimedia URLs, file blocks, and rich-editor media reloads behave more consistently.
+- 🤖 **More Reliable Local Agent Launches** — Claude, Gemini, OpenCode, and MCP server setup now handle modern CLI behavior and Windows paths more gracefully.
+- 🧱 **Smoother Editor Navigation** — Breadcrumb titles, neighborhood toggles, previous-list recovery, note renaming, and editor reloads now preserve more context.
+- 🌐 **Cleaner Release and Docs Publishing** — Release pages, GitHub Pages deployment, custom-domain docs, and updater metadata were hardened.
+
+## Stability and Fixes
+
+- Whiteboard dialogs, mermaid previews, tldraw context menus, and dark-mode rendering are more resilient.
+- The editor now guards more stale-selection, stale-block, paste, tab-switch, and save-before-switch edge cases.
+- Security and quality hardening resolved multiple Codacy findings around mock vault APIs, regexes, object injection, focus handling, and history flows.
+- Test coverage was expanded for note history edits, telemetry onboarding, rich-editor media reloads, Cmd+N persistence, save-before-switch behavior, and editor draft preservation.
+- Internal app orchestration, vault setup, inbox advance, and Git file workflow code was split into smaller focused pieces without changing the released user model.