`common/Switch.svelte` already accepts `id`, `ariaLabel` and `ariaLabelledbyId`, but **not one of the 148 `<Switch>` instances under `src/lib/components/admin/` passes any of them**.
`admin/Settings/AdminSettingRow.svelte` renders the row label as a plain `<div>` and the control in a **sibling** slot, so there is nothing tying them together. bits-ui renders the switch as a `<button role="switch">` whose subtree is a text free thumb, so it has no accessible name from any source.
A screen reader user working through Admin Settings hears a long run of "switch, on" and "switch, off" with no indication of what any of them controls.
Breaks WCAG 4.1.2 Name, Role, Value (Level A) and 1.3.1 Info and Relationships (Level A).
Fix: `AdminSettingRow` mints a per instance id, puts it on the label element, and hands it to the default slot, so each row's switch can point at the label that is already rendered next to it. This is the pattern `chat/Settings/Interface.svelte` already uses by hand in 45 places, hoisted into the shared row component so call sites stop hand authoring ids.
`aria-labelledby` rather than a wrapping `<label>`: per HTML-AAM a `<button>` takes its name from `aria-labelledby`, then `aria-label`, then its own subtree, never from an associated `<label>`. `chat/Settings/Subagents.svelte` already wraps two switches in a `<label>` and they are still unnamed, which is the same trap. Using the existing label element also guarantees the accessible name is byte identical to the visible text, which keeps voice control working.
The `description` paragraph deliberately sits outside the referenced element, so verbose help text is not pulled into the name.
Scope: this covers the **72** switches that live inside an `AdminSettingRow`, which is every switch that flows through the shared row component. There are no rows containing more than one switch, so nothing is silently skipped.
The remaining 76 admin switches are not in this component and are not touched. 64 of them are in `admin/Users/Groups/Permissions.svelte`, which hand rolls its own row markup, and the other 12 are per entity toggles in lists and dropdowns where the label is a dynamic row name. `Permissions.svelte` is the worst remaining case, 64 toggles with near identical adjacent labels, and it needs either its own labelling pass or a conversion to `AdminSettingRow` that changes its visual styling. Either way that is not an accessibility only diff and belongs in its own PR.
All 12 touched files compile with the Svelte compiler with no new warnings and are Prettier clean.
Severity: Serious. Admin Settings is unusable with a screen reader.
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