web-ui: size chat gutters by the surface's own width, not the window - #424
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A chat pane's column width and gutters were driven by window-level responsive state: a max-width media query set the layout variables globally on :root, and the height-driven compact density tier hard-coded the chat scroll's horizontal padding. In the split canvas a pane's size is decoupled from the window, so resizing the window flipped panes between a centered column with wide gutters and a full-bleed layout — user messages crowded the pane edge. Each chat surface is now an inline-size container and the layout variables are driven by container queries on the surface's own width; the compact density tier only squeezes vertical padding. Single-pane behavior at the same widths is unchanged.
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…424) A chat pane's column width and gutters were driven by window-level responsive state: a max-width media query set the layout variables globally on :root, and the height-driven compact density tier hard-coded the chat scroll's horizontal padding. In the split canvas a pane's size is decoupled from the window, so resizing the window flipped panes between a centered column with wide gutters and a full-bleed layout — user messages crowded the pane edge. Each chat surface is now an inline-size container and the layout variables are driven by container queries on the surface's own width; the compact density tier only squeezes vertical padding. Single-pane behavior at the same widths is unchanged. <!-- codesmith:footer --> --- <a href="https://app.blacksmith.sh/yc-software/codesmith/qm/pr/400"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-light-v2.svg"><img alt="View with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/view-with-codesmith-dark-v2.svg"></picture></a> <a href="https://backend.blacksmith.sh/track/enable-autofix?expires=1789237877&installation_model_id=19911&pr_number=400&repository=yc-software%2Fqm&return_to=https%3A%2F%2Fgithub.com%2Fyc-software%2Fqm%2Fpull%2F400&signature=3d4a1d708fdac29a61ecb6becbfb764621031eb26578e634623d9c429472b8d7"><picture><source media="(prefers-color-scheme: dark)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-light.svg"><img alt="Autofix with [code]smith" src="https://pr-comments-assets.blacksmith.sh/codesmith/autofix-with-codesmith-dark.svg"></picture></a> <sup>Need help on this PR? Tag <code>@codesmith-bot</code> with what you need. Autofix is disabled.</sup> <!-- codesmith:autofix:disabled --> <!-- /codesmith:footer -->
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A chat pane's column width and gutters were driven by window-level responsive state: a max-width media query set the layout variables globally on :root, and the height-driven compact density tier hard-coded the chat scroll's horizontal padding. In the split canvas a pane's size is decoupled from the window, so resizing the window flipped panes between a centered column with wide gutters and a full-bleed layout — user messages crowded the pane edge. Each chat surface is now an inline-size container and the layout variables are driven by container queries on the surface's own width; the compact density tier only squeezes vertical padding. Single-pane behavior at the same widths is unchanged.
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