* feat(app): let users set the chat and Markdown content width
Wide and ultrawide screens were stuck with an 820px reading column. The
width is now an Appearance setting that flows through the Unistyles theme,
like the font sizes, so every content surface picks it up.
The stored value stays null until the user picks a width, so a future
change to the default reaches everyone who never customized it. Reset
writes null back.
The native composer dock keeps plain React Native styles and takes the width
inline because those styles land on Reanimated views, where theme-driven
Unistyles crash on theme changes.
* fix(app): pass the content width into the web stream viewport
The viewport read app settings itself, which required a QueryClient in every
render of the stream strategy. The agent stream view already reads settings,
so it hands the width over with the rest of the render input.
* fix(app): keep reconnect toast transitions continuous
Preserve the toast surface when its content changes, and apply initial appearance before mounting screens so settings hydration cannot restart a visible toast.
* test(app): use supported appearance QA coverage
* feat(app): separate content typography from interface size
Readable prose benefits from its own scale without inflating navigation and controls. Preserve existing users’ rendered size during migration while giving fresh desktop installs a 15px content default.
* test(app): cover independent content typography
The appearance journey now verifies that changing interface size leaves content size intact. Timeline traversal yields when a test deliberately holds the requested page, so the helper no longer waits on its own gate.
* test(desktop): cover independent content typography
The desktop appearance regression follows the renamed Interface control and verifies it does not alter Content size.
Adds plugin-contributed light and dark app themes, including persistence, host-aware coalescing, fallback behavior, documentation, examples, and browser/iOS QA.
Mohamed Boudra