Prepare v0.3.0 changelog and announcement

apps/marketing/src/content/changelog/v0.3.0.md

@@ -0,0 +1,54 @@
+---
+version: 0.3.0
+date: 2026-07-31
+title: Browser-first work, a focused inbox, and durable context
+summary: Work with agents beside a live browser, organize active and wrapped threads from a focused inbox, and carry prompts, settings, and thread state safely across contexts and devices.
+githubRelease: https://github.com/Threadlines/threadlines/releases/tag/v0.3.0
+highlights:
+  - title: A live browser beside every agent thread
+    description: Open local pages beside chat in a responsive, tabbed browser that Codex and Claude can navigate. Inspect, annotate, draw on, and attach page context without leaving Threadlines.
+    evidence:
+      - "7fa4712f"
+      - "04cc9f91"
+      - "d8d7c7e4"
+  - title: An inbox built around attention
+    description: The redesigned sidebar separates active work from Wrapped threads, keeps blockers and unseen completions visible, and syncs filing and unread state between desktop and phone.
+    evidence:
+      - "7842e145"
+      - "04f4a91b"
+  - title: Stash prompts with their context intact
+    description: Save unfinished prompts with attachments and context, switch threads or providers, then restore them later from the composer or with Cmd/Ctrl+S.
+    evidence:
+      - "d4f7a39d"
+  - title: Inspect delegated work in place
+    description: Open Claude and Codex subagent transcripts inside the parent conversation to follow delegated work without breaking your flow.
+    evidence:
+      - "d0ac9007"
+alsoImproved:
+  - description: Settings now come from the paired computer, and retention rules are applied server-side.
+    evidence:
+      - "50daa7f5"
+  - description: Browser navigation approvals use clearer controls and readable destination text.
+    evidence:
+      - "04cc9f91"
+      - "2f2f021a"
+  - description: Completed threads keep running terminal status visible, and clean checkouts reset diff stats.
+    evidence:
+      - "eb1c4a56"
+      - "b9422241"
+  - description: Local preview discovery now supports IPv6 servers.
+    evidence:
+      - "570ef9b2"
+  - description: Touch scrolling no longer fights timeline auto-follow.
+    evidence:
+      - "1fc7ee6c"
+social: |-
+  Threadlines v0.3.0 is out 🧵
+
+  • Built-in browser agents can drive
+  • Inbox sidebar for active + wrapped work
+  • Annotate pages straight into prompts
+  • Stash prompts and inspect subagents
+
+  Release notes: https://github.com/Threadlines/threadlines/releases/tag/v0.3.0
+---