Surface unsent drafts in the sidebar

[badcuban]

Typing into a new-thread composer and navigating away used to strand the draft: it survived in the store but nothing pointed back to it, and the next "new thread" could repurpose or garbage-collect it.

What changed

• Every draft session with real user content (typed text, attachments, or context chips — model/mode picks alone don't count) now renders a two-line row at the top of the sidebar: amber pen glyph + project favicon + project name, then the first line of the prompt. Clicking navigates back to /draft/$draftId with composer text, attachments, and workspace context intact. The block vanishes at count 0.
• New-thread surfaces (button, hotkeys, "/" landing, palette) only ever reuse a draft with no user content. An invested draft stays parked in the sidebar and a fresh draft is minted beside it.
• Store: composerDraftHasUserContent gates remap GC and persistence — invested sessions survive unmapped, zombie sessions are dropped together with their composer blobs at partialize time; clearProjectDraftThreadId sweeps a project's unmapped sessions too; getDraftSessionByProjectRef prefers the currently-mapped draft over older unmapped ones.
• Discarding a row asks for confirmation (same AlertDialog pattern as the prompt stash). Discarding the open draft lands back on the home composer via the draft route's existing redirect.
• While a draft is open, its row renders a snapshot frozen at route-change time so typing never repaints the sidebar; the parent subscribes to a row count only.

Behavior notes

• One deliberate change: "New thread" with a half-typed draft no longer reuses/wipes it — you get a fresh composer and the old draft stays one click away.
• General-chat drafts are excluded from the block (general chats never join the inbox).
• A draft whose project is unknown (other machine, deleted project) renders as "Unknown project" unscoped and is hidden under any project scope.

Testing

• vp fmt / vp lint / vp run typecheck clean; full web unit suite (2104 tests) and browser suite (393 tests, incl. 3 new SidebarDrafts cases) green.
• Live-verified in a throwaway stack (scratch server + web, Playwright): row appears on navigate-away, restore, newest-first ordering, reload persistence (debounced localStorage), discard confirm/cancel, discarding the open draft (redirects to a fresh home composer), no row for a never-left draft, and the empty-state gate. No console errors; hover reveals the discard X with zero layout shift; light and dark mode checked.

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Project	Deployment	Actions	Updated (UTC)
threadlines	Ready	Preview	Aug 10, 2026 6:43am