Add List View lab icon and make lab feature flag icons mandatory (#23930)

## Context

The List View toggle in Settings → Lab rendered without an icon: the
front end kept a hardcoded `Partial<Record<FeatureFlagKey,
IconComponent>>` map, so nothing caught a public feature flag added
without an icon.

## What this PR does

Moves the icon into the public feature flag metadata, next to `label`
and `description`, as a **required** field — so a lab flag now registers
in one place and can't be declared without an icon (server typecheck
fails otherwise):

- `twenty-server`: `FeatureFlagMetadata` gains required `icon: string`;
each `PUBLIC_FEATURE_FLAGS` entry declares its icon (`IconList` for List
View — the icon already used for the List view type).
`PublicFeatureFlagMetadata` GraphQL entity exposes it.
- `twenty-front`: `SettingsLabContent` renders
`getIcon(flag.metadata.icon)` via `useIcons`, the same metadata-driven
icon pattern used across the app; the hardcoded icon map is deleted.
- `twenty-ui`: registers `IconCalendarWeek` in `AllIcons` — it was
importable but not resolvable by name through `useIcons`, so it would
have silently fallen back to the default icon.
- Generated artifacts (`twenty-front/src/generated-metadata`,
`twenty-client-sdk/src/metadata/generated`) updated for the new field.

## Verification

- `nx run-many -t typecheck,lint -p twenty-front twenty-server
twenty-shared twenty-client-sdk twenty-ui` passes (oxlint + oxfmt
clean).
- Negative case: removing `icon` from a `PUBLIC_FEATURE_FLAGS` entry
fails `twenty-server:typecheck` with `TS2741: Property 'icon' is missing
… but required in type 'FeatureFlagMetadata'`.

packages/twenty-front/src/generated-metadata/graphql.ts

@@ -4502,6 +4502,7 @@ export type PublicFeatureFlag = {
 export type PublicFeatureFlagMetadata = {
   __typename?: 'PublicFeatureFlagMetadata';
   description: Scalars['String']['output'];
+  icon: Scalars['String']['output'];
   imagePath?: Maybe<Scalars['String']['output']>;
   label: Scalars['String']['output'];
 };

packages/twenty-front/src/modules/settings/lab/components/SettingsLabContent.tsx

@@ -5,15 +5,10 @@ import { useAtomStateValue } from '@/ui/utilities/state/jotai/hooks/useAtomState
 import { styled } from '@linaria/react';
 import { isNonEmptyString } from '@sniptt/guards';
 import { useState } from 'react';
-import {
-  IconCalendarWeek,
-  IconRelationManyToMany,
-  IconSparkles,
-  type IconComponent,
-} from 'twenty-ui/icon';
+import { useIcons } from 'twenty-ui/icon';
 import { Card } from 'twenty-ui/surfaces';
 import { themeCssVariables } from 'twenty-ui/theme-constants';
-import { FeatureFlagKey } from '~/generated-metadata/graphql';
+import { type FeatureFlagKey } from '~/generated-metadata/graphql';
 
 const StyledCardGrid = styled.div`
   display: grid;
@@ -29,14 +24,9 @@ const StyledImage = styled.img`
   width: 100%;
 `;
 
-const labFeatureFlagIcons: Partial<Record<FeatureFlagKey, IconComponent>> = {
-  [FeatureFlagKey.IS_CALENDAR_WEEK_VIEW_ENABLED]: IconCalendarWeek,
-  [FeatureFlagKey.IS_JUNCTION_RELATIONS_ENABLED]: IconRelationManyToMany,
-  [FeatureFlagKey.IS_SETTINGS_DISCOVERY_HERO_ENABLED]: IconSparkles,
-};
-
 export const SettingsLabContent = () => {
   const currentWorkspace = useAtomStateValue(currentWorkspaceState);
+  const { getIcon } = useIcons();
   const { labPublicFeatureFlags, handleLabPublicFeatureFlagUpdate } =
     useLabPublicFeatureFlags();
   const [hasImageLoadingError, setHasImageLoadingError] = useState<
@@ -75,7 +65,7 @@ export const SettingsLabContent = () => {
               />
             )}
             <SettingsOptionCardContentToggle
-              Icon={labFeatureFlagIcons[flag.key]}
+              Icon={getIcon(flag.metadata.icon)}
               title={flag.metadata.label}
               description={flag.metadata.description}
               checked={flag.value}
@@ -93,7 +83,7 @@ export const SettingsLabContent = () => {
             {labPublicFeatureFlagsWithoutImage.map((flag, index) => (
               <SettingsOptionCardContentToggle
                 key={flag.key}
-                Icon={labFeatureFlagIcons[flag.key]}
+                Icon={getIcon(flag.metadata.icon)}
                 title={flag.metadata.label}
                 description={flag.metadata.description}
                 checked={flag.value}