Rename the app shell to the scaffold and give it a FAB slot

Plan step 35: <x-app-shell> becomes <x-scaffold>, M3's and Compose's name
for the structure of bars, rails and panes, with no alias; every package
view, the showcase, the tests, the skills, README and UPGRADE follow. Its
markup and Tailwind classes stay for the navigation rewrite. The new fab
slot places the FAB as Compose's Scaffold does - bottom-end, 16px from the
edges below medium and 24px from it, clear of the navigation bar and of a
snackbar on screen (resources/css/layout/scaffold.css) - and the content
region tells a pane inside that the margin is already drawn.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
This commit is contained in:
Andreas Reinhold / reini
2026-09-14 14:51:48 +02:00
co-authored by Claude Opus 5
parent acd6ba21ae
commit 0013e0154d
24 changed files with 301 additions and 120 deletions
@@ -215,7 +215,7 @@ Layout keys on the width of the window, in M3's five window size classes; they a
| Large | 12001599px | `large:` | rail expanded | 2; a fixed pane 412px | basic dialog; menu | 24px |
| Extra-large | 1600px and up | `extra-large:` | rail expanded | 2, or 3 with a standard side sheet (at most 400px) | basic dialog; menu | 24px |
- `<x-app-shell>` implements the navigation column; `<x-drawer pane>` is the second pane of a list-detail layout from `expanded:`, a supporting pane (360px, beside the focus pane) from `expanded:` and below it before that. Moving up a class, ask what to reveal, divide into panes, resize, reposition or swap — never swap a component for one that does not do the same job.
- `<x-scaffold>` implements the navigation column; `<x-drawer pane>` is the second pane of a list-detail layout from `expanded:`, a supporting pane (360px, beside the focus pane) from `expanded:` and below it before that. Moving up a class, ask what to reveal, divide into panes, resize, reposition or swap — never swap a component for one that does not do the same job.
- Scaffold: bars (app bar at the top, navigation bar at the bottom: 35 destinations), rails (the navigation rail, toolbars, the FAB, on the leading edge), panes (all content), around a safety region that stays clear of the device's own chrome (`--material-safe-top|bottom|left|right`).
- Canonical layouts: feed (a grid of cards that gains columns per class), list-detail (one pane on compact, two from expanded; a back button only in single-pane mode, a selected row only in two-pane mode), supporting pane (two thirds focus, one third support).
- Bidirectionality: write logical properties (`ps-4`, `me-2`, `start-0`, `text-start`, `border-s`); leading and trailing icons swap, directional icons (back, send) mirror, the rail moves to the right; charts, media controls, clocks and Hebrew progress bars stay left-to-right.