La Suite parity: replicate the shell/chrome geometry (header, sidebar, spacing rhythm) — later

[rubenvdlinde]

Context

The lasuite token set gives Nextcloud La Suite's design language (Cunningham colours, type, radii, spacing) and per-component parity (button/input/modal/table). That makes individual components visually indistinguishable from La Suite.

What it deliberately does NOT do yet is reshape Nextcloud's shell: header height, the app-menu, sidebar width/behaviour, content max-widths, and the overall page rhythm. Nextcloud and La Suite Docs are different applications, so the chrome still reads as Nextcloud even when the components match.

Why deferred

• NC 34's header markup is high-churn (server#60803 / #59888 were partly reverted during RCs); heavy chrome overrides break on point releases and need a version-scoped stylesheet.
• It is a large, fragile surface with a different risk profile than the token/component work.

Scope when picked up

• Header geometry + app-menu restyling to approach the La Suite Docs shell
• Sidebar width/behaviour and content max-widths
• Vertical rhythm / spacing scale applied to the shell
• A version-scoped stylesheet + Playwright visual baselines per NC release so a point release can't silently break it

Prereq

The token-completeness + component-parity work (in progress) should land first, so the shell work builds on a complete Cunningham foundation.

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