feat: conversation list + manage for "Ask your library" (P13d-2b)

[blokzdev]

P13d-2b — Conversation list + manage

Makes the "Ask your library" GraphRAG chat multi-conversation. No schema change (v14 already forward-included chats.title, chats.archivedAt, chat_messages.citationsJson) and no new deps — repository methods + providers + two list screens + a resumable controller.

List-first entry

The Dashboard "Ask" tile (/ask) now opens a ConversationsScreen: past chats most-recent-first, each with a last-message preview + relative time, a "New chat" FAB, and an empty-state CTA. Archived threads live behind /ask/archived (ArchivedChatsScreen), reached from the app-bar overflow.

• /ask → conversation list · /ask/chat → new chat · /ask/chat/:id → continue · /ask/archived → archived.
• Per-row overflow: Rename / Archive / Delete (active) or Unarchive / Delete (archived); delete confirms and cascades its messages.

Resumable chat

AskController is now a family keyed by String? chatId — a seeded id continues that thread (its bounded history feeds back into the next turn via the existing messagesToHistory + fitHistory path), while null creates the chat on first send (the d-2a behaviour). AskScreen takes a chatId and shows the live, renamable conversation title.

Repository

ChatRepository gains watchChatList({archived}) (one reactive query with a correlated latest-message preview subquery — no N+1), renameChat (blank ignored), setArchived, deleteChat, and watchChatTitle; plus activeChatsProvider / archivedChatsProvider / chatTitleProvider.

Tests (CI-verifiable; native generation is APK-verified)

• Repo: recency + preview ordering, active-vs-archived split, archive toggle round-trip, rename (incl. blank-ignored), and cascade delete.
• Controller: continuing a seeded chat appends to it and feeds prior turns as history (no new chat created); existing new-chat/no-sources/error cases adapted to the family key.
• Widget: ConversationsScreen renders rows + preview, shows the empty-state CTA, and exposes the row Rename/Archive/Delete menu.
• Full suite green (867 tests), dart format + flutter analyze clean.

Docs

• docs/design/P13-PLAN.md — d-2b → [~] with as-built status.
• docs/VERIFICATION.md — P13d-2b APK checklist (two chats listed; reopen continues with context offline; rename/archive/unarchive/delete; empty-state CTA).
• docs/BACKLOG.md — deferrals: conversation search/pin, bulk actions + swipe-to-archive, content-based re-titling.

Verification

• ✅ CI gates green locally (format · analyze · 867 tests).
• ⏳ APK spot-check owed: two chats list with previews; reopen → continues with retained context offline; rename persists; archive hides/restores; delete removes (and its messages); empty-state CTA starts a chat.

Next: d-3 (low/ineligible-tier retrieval-only fallback + tier-aware history depth + LLM/Cozo HNSW RAM co-residency), which closes P13d.

https://claude.ai/code/session_013JoYmLCosYt5tQ8qwdbL1T

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