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gsxdsm 035caca6c8 FN-7775: Add thinking level selection to new chat model picker

Adds a per-session thinking-level selector to the new chat model dropdown, persisting the choice through the chat store and engine session options.

- Adds thinkingLevel column to chat_sessions with a db migration
- Extends chat-store, chat-types, and chat.ts to read/write thinkingLevel
- ChatView model selector now exposes a thinking-level control alongside model choice
- useChat and register-chat-routes plumb thinkingLevel through session creation/API
- engine/src/index.ts passes thinkingLevel as defaultThinkingLevel session option
- Adds a minor changeset and updates settings-reference/dashboard-guide docs
- Adds/updates unit tests across core and dashboard packages

Files changed:
 .changeset/fn-7775-chat-thinking-level.md          |  7 ++
 docs/dashboard-guide.md                            |  1 +
 docs/settings-reference.md                         |  2 +-
 packages/core/src/__tests__/chat-store.test.ts     | 15 +++-
 packages/core/src/__tests__/db-migrate.test.ts     | 33 ++++++++
 packages/core/src/chat-store.ts                    | 12 ++-
 packages/core/src/chat-types.ts                    |  6 ++
 packages/core/src/db.ts                            | 14 +++-
 packages/dashboard/app/api/legacy.ts               |  2 +-
 packages/dashboard/app/components/ChatView.tsx     | 16 +++-
 .../__tests__/ChatView.core-interactions.test.tsx  | 75 +++++++++++++++---
 .../dashboard/app/hooks/__tests__/useChat.test.ts  | 17 +++-
 packages/dashboard/app/hooks/useChat.ts            |  6 +-
 .../dashboard/src/__tests__/chat-manager.test.ts   | 90 ++++++++++++++++++++++
 packages/dashboard/src/chat.ts                     | 23 ++++++
 .../dashboard/src/routes/register-chat-routes.ts   | 25 +++++-
 packages/engine/src/index.ts                       |  1 +
 17 files changed, 318 insertions(+), 27 deletions(-)

Fusion-Task-Id: FN-7775

Fusion-Task-Lineage: e16c7d3b-361e-4908-87ad-10be17a47c47

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-10 08:00:34 -07:00