docs(navigator): spec for Base tab stacked-label layout

Design doc for upgrading the room-settings Base tab from the cramped
horizontal two-column rows to a stacked-label layout matching the
sibling Access tab. Also gitignore the .superpowers/ brainstorm dir.

docs/superpowers/specs/2026-05-31-navigator-base-tab-stacked-labels-design.md

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+# Navigator — Room Settings "Base" tab: stacked-label layout
+
+**Date:** 2026-05-31
+**Component:** Nitro-V3 client
+**File:** `src/components/navigator/views/room-settings/NavigatorRoomSettingsBasicTabView.tsx`
+**Type:** Layout-only refactor (no logic / data-flow change)
+
+## Problem
+
+The Base tab uses a horizontal two-column row layout: a fixed-width label on the
+left, the control on the right. In the narrow room-settings panel the label column
+is too tight, so multi-word Italian labels ("Visitatori massimi", "Impostazioni
+scambio") wrap onto two lines and look broken. An earlier fix replaced dead
+Bootstrap `col-3` classes with `w-1/4 shrink-0`, which stopped the crushing but
+still leaves the labels cramped and occasionally wrapping.
+
+The other five room-settings tabs (Access, Rights, VIP/Chat, Mod, Misc) already use
+idiomatic vertical/grouped layouts. Base is the outlier.
+
+## Decision
+
+Adopt the **stacked-label** pattern (chosen from three mockup options — A stacked,
+B sectioned cards, C wider label column). Each field becomes a vertical block: bold
+label on top, full-width control below, validation message underneath. This mirrors
+the sibling **Access** tab's existing `<Column gap={1}>` + `<Text bold>` shape, so
+the two tabs become visually consistent and labels can never wrap.
+
+## Layout
+
+Every field → its own `<Column gap={1}>` block:
+
+```tsx
+<Column gap={ 1 }>
+    <Text bold>{ LocalizeText('navigator.roomname') }</Text>
+    <input className="form-control form-control-sm" value={ roomName } … onBlur={ saveRoomName } />
+    { (roomName.length < ROOM_NAME_MIN_LENGTH) &&
+        <Text bold small variant="danger">{ LocalizeText('navigator.roomsettings.roomnameismandatory') }</Text> }
+</Column>
+```
+
+Field-by-field:
+
+- **Nome stanza** — stacked block, mandatory-name validation preserved.
+- **Descrizione** — stacked block, `<textarea>` full width.
+- **Categoria** — stacked block, `<select>` from `categories`.
+- **Visitatori massimi** — stacked block, `<select>` from `GetMaxVisitorsList`.
+- **Impostazioni scambio** — stacked block, 3-option `<select>`.
+- **Tag** — one "Tag" label, then the two tag inputs side-by-side in a
+  `<Flex gap={1}>`, each `fullWidth`, each keeping its own length/type validation.
+- **allow_walkthrough / allow_underpass** — remain inline `checkbox + label` rows;
+  remove the empty `<Base className="w-1/4 shrink-0" />` spacers that only existed
+  to align with the old label column.
+- **Delete link** — unchanged at the bottom.
+
+## Explicit non-goals
+
+- No change to `handleChange` field names or values.
+- No change to validation thresholds (`ROOM_NAME_MIN_LENGTH=3`,
+  `ROOM_NAME_MAX_LENGTH=60`, `DESC_MAX_LENGTH=255`, `TAGS_MAX_LENGTH=15`).
+- No change to save-on-blur handlers (`saveRoomName`, `saveRoomDescription`,
+  `saveTags`), the `RoomSettingsSaveErrorEvent` subscription, or `deleteRoom`.
+- No change to field order or any localization key.
+- No change to the other five tabs.
+- The `w-1/4 shrink-0` utility classes added in the prior fix are removed (labels
+  are full-width now).
+
+## Risk
+
+Single-file, JSX-only diff. No test covers this view, so no test impact. Manual
+check: open Room Settings → Base, confirm no label wraps, all controls full width,
+validation still appears, save-on-blur still fires.