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gsxdsm 03bca1787b FN-7907: Add project chat default (model/agent) setting and New Chat default behavior

Adds a project-scoped Direct-chat default (model pair or durable agent) plus a New Chat behavior toggle (prompt vs. always-use-default), surfaced in Project Models settings using the standard model dropdown.

- Add ProjectSettings fields: chatNewSessionMode, chatDefaultKind, chatDefaultAgentId, chatDefaultModelProvider, chatDefaultModelId, chatDefaultThinkingLevel
- Extend settings-schema validation for the new chat default fields
- Add a "Chat" subsection to ProjectModelsSection with New Chat behavior selector, model/agent target toggle, and the standard CustomModelDropdown for model selection
- Update ChatView.tsx handleNewChat() flow to honor the configured default (prompt vs. immediate session creation)
- Add i18n strings across en/es/fr/ko/zh-CN/zh-TW locales and regenerate resources.d.ts
- Add changeset (@runfusion/fusion minor) and update docs/settings-reference.md and docs/dashboard-guide.md
- Add settings-parity, ChatView new-chat-default, and ProjectModelsSection chatDefault test coverage

Files changed:
 .changeset/fn-7907-chat-default.md                 |   7 +
 docs/dashboard-guide.md                            |   3 +-
 docs/settings-reference.md                         |   8 +
 packages/core/src/__tests__/settings-parity.test.ts     |  20 ++
 packages/core/src/settings-schema.ts               |   6 +
 packages/core/src/types.ts                         |  15 +
 packages/dashboard/app/components/ChatView.tsx     |  93 +++++-
 packages/dashboard/app/components/__tests__/ChatView.new-chat-default.test.tsx   | 357 +++++++++++++++++++++
 packages/dashboard/app/components/settings/sections/ProjectModelsSection.tsx     |  77 +++++
 packages/dashboard/app/components/settings/sections/__tests__/ProjectModelsSection.chatDefault.test.tsx |  193 +++++++++++
 packages/i18n/locales/en/app.json                  |  20 +-
 packages/i18n/locales/es/app.json                  |  20 +-
 packages/i18n/locales/fr/app.json                  |  20 +-
 packages/i18n/locales/ko/app.json                  |  20 +-
 packages/i18n/locales/zh-CN/app.json               |  20 +-
 packages/i18n/locales/zh-TW/app.json               |  20 +-
 packages/i18n/src/resources.d.ts                   |  18 ++
 17 files changed, 899 insertions(+), 18 deletions(-)

Fusion-Task-Id: FN-7907

Fusion-Task-Lineage: 86a81b9c-7e0c-4033-9e2a-6f7380810fe9

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

2026-07-12 20:54:10 -07:00