fix: enforce the image generation flag on the legacy chat feature path (#27759)

* fix: enforce the image generation flag on the legacy chat feature path

* fix: refresh the config store when image generation is disabled in admin settings

* fix: hide active feature pills when the feature is no longer available

src/lib/components/admin/Settings/Images.svelte

@@ -150,8 +150,9 @@
 		});
 
 		if (res) {
+			backendConfig.set(await getBackendConfig());
+
 			if (res.ENABLE_IMAGE_GENERATION) {
-				backendConfig.set(await getBackendConfig());
 				getModels();
 			}
 

src/lib/components/chat/MessageInput.svelte

@@ -2241,7 +2241,7 @@
 												{/if}
 											{/each}
 
-											{#if webSearchEnabled}
+											{#if webSearchEnabled && showWebSearchButton}
 												<Tooltip content={$i18n.t('Web Search')} placement="top">
 													<button
 														on:click|preventDefault={() => (webSearchEnabled = !webSearchEnabled)}
@@ -2259,7 +2259,7 @@
 												</Tooltip>
 											{/if}
 
-											{#if imageGenerationEnabled}
+											{#if imageGenerationEnabled && showImageGenerationButton}
 												<Tooltip content={$i18n.t('Image')} placement="top">
 													<button
 														on:click|preventDefault={() =>
@@ -2277,7 +2277,7 @@
 												</Tooltip>
 											{/if}
 
-											{#if codeInterpreterEnabled}
+											{#if codeInterpreterEnabled && showCodeInterpreterButton}
 												<Tooltip content={$i18n.t('Code Interpreter')} placement="top">
 													<button
 														aria-label={codeInterpreterEnabled