Andrew Aquino 039c0da5ae feat(site/src/pages/TemplateBuilder): make sidebar steps navigable (#28153)
## What

Makes the remaining `SelectionSummary` sidebar elements clickable jump
targets on `/templates/new/builder`, continuing the work from #27351
(which made module rows navigable).

Clickable now:

| Sidebar element | Jumps to |
|---|---|
| `Base Template` label | `base-infra` |
| Selected base-template row | `base-parameters` (falls back to
`base-infra` when that step is skipped) |
| `Modules` label | `module-select` |
| Each module row | `module-settings` + scroll (already shipped in
#27351) |
| `Customizations` label | `customizations` |

## Back-stack behavior

The sidebar previously colored groups purely from the current step, so
jumping backward would grey out and disable steps you had already
reached. This adds a `maxReachedGroup` that never shrinks on backward
navigation:

- Groups at or below the furthest-reached group stay `complete` (green)
and clickable, like a browser back-stack.
- Groups strictly above render as `upcoming` and inert (no button, no
hover, not focusable).
- The connecting divider color keys off `maxReachedGroup`, not the
current step, so it stays green after navigating backward.

Clickability is gated on `maxReachedGroup` (you can only jump to steps
you have already reached).

## Changes

- `SelectionSummary.tsx`: new required `maxReachedStep` and
`onNavigateStep` props. Split the single `variant()` into
`indicatorVariant` (label circle), `dividerVariant` (connecting line),
and a `reachable()` gate. `StepIndicator` and `BaseTemplateSelection`
render as `<button>` (hover + focus ring, `aria-label`) when a reachable
handler is supplied, else stay inert.
- `TemplateBuilderPageView.tsx`: track `maxReachedGroup`; add
`navigateToStepId(stepId)` that resolves skipped steps via
`nearestVisible` (so `base-parameters` falls back to `base-infra`) and
mirrors the existing customizations reset when leaving that step. Wire
both new props into `SelectionSummary`.
- `SelectionSummary.stories.tsx`: add `onNavigateStep` to meta and
`maxReachedStep` to existing stories; add `NavigationClicks` (asserts
each label/base/module callback), `BackwardNavigation` (dividers stay
green), and `UpcomingStepsInert` (steps above max-reached are not
buttons).

## Out of scope

Everything else from #27077 stays out: gallery height, sensitive-var
banner relocation, trash-icon wiring, and the scroll-past required-field
subsystem.

## Testing

- `pnpm check` (biome) clean
- `pnpm lint:types` (tsc) clean
- `pnpm vitest run --project=storybook src/pages/TemplateBuilder` — 37
pass
- `pnpm vitest run --project=unit src/pages/TemplateBuilder` — 55 pass

<details>
<summary>Implementation plan / decision log</summary>

### Origin

This is the remainder of PR #27077's item #2 (navigable selection
summary), rebased onto current `main` after #27351 shipped the
module-row navigation.

### Why a `maxReachedGroup` back-stack

`furthestAllowedIndex(state)` on current `main` is all-or-nothing (0
without a base selected, otherwise the last step), so it cannot express
"how far the user has progressed" for the sidebar coloring. A monotonic
`maxReachedGroup` (bumped when the current group advances, never shrunk)
is needed to keep completed steps green and clickable after backward
navigation, matching #27077.

### Decisions

- Reachability gating: gate both coloring and clickability on
`maxReachedGroup` (only jump to steps already reached), rather than the
looser `furthestAllowedIndex` (which would let users skip required steps
once a base is chosen).
- Base-template row target: jump to `base-parameters` and let
`nearestVisible` fall back to `base-infra` when the base has no
parameters/prerequisites.
- Module rows: keep `onNavigateModule` passed directly (not re-gated on
reachability), since a module can only be selected after reaching group
2, so `reachable(2)` is always true when module rows render. This
preserves the earlier decision to keep the module row's handler required
with no inert branch.

</details>

---

Coder Agents generated, on behalf of @aqandrew.
2026-08-17 12:15:29 -07:00
2022-04-04 11:55:06 -05:00

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