feat(chat): conversation model override, collapsible turns, and a real /clear (v5.1.2)

[dnviti]

Summary

The 5.1.2 release. Four features and the fixes that followed them, accumulated on this branch through #39, #40, #41, #47 and #49.

Added

• A conversation can run its own model (feat(chat): let users override a conversation's model #39, closes Allow freely changing the conversation model, independent of default settings #38). Chosen from the list the runtime advertises or typed freely, independent of the profile default and never written back as one. Where the runtime can switch without restarting it does so immediately; otherwise the choice is saved for the next launch, and the reply says which of the two happened rather than claiming success either way.
• Turns fold away (feat(chat): collapsible turn sections, auto-folded on a new turn #40, closes Chat turns should be collapsible sections, auto-folded when a new turn starts #34). Each turn's header collapses to hide everything under it, and a turn folds on its own once the next one begins. The turn index can open or close them all, and a folded turn still says what it was about while keeping its copy and branch actions.

Fixed

• The runtime's slash commands are there from the moment a conversation opens (fix(chat): show Claude's slash commands from the moment a session opens #41, closes Slash commands unavailable until the first message is sent #30), rather than only after the first message had been sent.
• /clear and /new really do start over (fix(chat): /clear and /new actually reset the conversation #47, closes /clear and /new don't actually reset the conversation — old history returns on next message #43). The transcript went blank but the text was handed to the agent like any other message, so the process kept the whole conversation in mind and the next answer brought it back.
• Five defects introduced by the four PRs above (fix(chat): show the answer as it streams, and keep a model override across /clear #49, closes Turn title font size too large and overflows title bar #48). The worst blanked the chat entirely: the message list looked messages up in a map memoised on an array the transcript mutates in place, so it froze at mount and every later message rendered nothing while the strips above kept ticking. Also: a model override lost whenever /clear restarted the agent, a collapsed turn's title escaping its bar, an override that could not be undone, and unbounded model names.

Verification

Typecheck clean · 1359 unit tests · 54/54 browser checks · CI green on Node 22 and 24, the documented install, and the Docker build.

Every fix in #49 has a test confirmed to fail against the unfixed code. The browser checks now also run in CI — before this release they gated nothing, and npm test passed 1357/1357 with the chat completely broken.

Note

Defects introduced and fixed within this branch are deliberately absent from the changelog: they were never in a released build, so listing them would document bugs against a release that never existed.

Merging tags v5.1.2, publishes the release and pushes the Docker image.

[Copilot]

Pull request overview

Bumps the npm package version to 5.1.2 and records the release in the changelog so the release-on-main.yml workflow can tag and publish the 5.1.2 release on merge to main.

Changes:

• Update package.json version to 5.1.2.
• Update package-lock.json root/package entry versions to 5.1.2.
• Add a CHANGELOG.md entry for 5.1.2 noting it’s a version-only release.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Bumps the published package version to 5.1.2.
package-lock.json	Keeps lockfile metadata versions in sync with 5.1.2.
CHANGELOG.md	Adds a 5.1.2 entry indicating no functional changes.

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