ui: Sidebar Conversations Bulk Action + Improved Settings logic/UI (#25815)

* feat: WIP

* feat: Replace conversation rename flow with unified AlertDialog component

* feat: Add radio group component and consolidate title generation settings

* refactor: Remove JS Sandbox global toggle and migrate legacy user state

* chore: Formatting

* refactor: Cleanup

Co-authored-by: Aleksander Grygier <aleksander.grygier@gmail.com>

* refactor: Cleanup

* refactor: Marquee selection hook

* feat: UI improvements

* refactor: Bulk db operations

* fix: optimize bulk conversation deletion to handle ancestor chains

* refactor: remove pairedKey mechanism from settings system

* fix: remove redundant onclick handler from dialog cancel button

* chore: pin @lucide/svelte to exact version

* feat: Run JavaScript tool disabled by default

* fix: correct active conversation deletion tracking in bulk delete

* feat: improve shift-key multi-selection support in sidebar via keyboard

* refactor: Retrieve JS Tool enabling via Developer Settings

* nits: sync, dialog wording, cycle guard, and lockfile follow-ups

- Restore titleGenerationUseLLM registry entry so it syncs across devices again
- Mention fork cascade in the bulk delete confirmation dialog
- Clear newParent on cycle guard break so children never point at a deleted conversation
- Align @lucide/svelte in package-lock.json with the exact pin in package.json

---------

Co-authored-by: Pascal <admin@serveurperso.com>

tools/ui/src/lib/components/app/navigation/SidebarNavigation/SidebarNavigationActions.svelte

@@ -119,9 +119,7 @@
 					: onSearchClick}
 			{@const itemTransition = {
 				duration: ICON_STRIP_TRANSITION_DURATION,
-				delay: !initialized
-					? ICON_STRIP_TRANSITION_DELAY_MULTIPLIER + i * ICON_STRIP_TRANSITION_DELAY_MULTIPLIER
-					: 0,
+				delay: !initialized ? i * ICON_STRIP_TRANSITION_DELAY_MULTIPLIER : 0,
 				easing: circIn
 			}}
 
@@ -140,10 +138,8 @@
 							{@render itemIcon(item.icon)}
 
 							{#if showIcons}
-								<span
-									in:fade={{ duration: 150, easing: circIn, delay: 50 }}
-									out:fade={{ duration: 100 }}
-									class="min-w-0 truncate">{item.tooltip}</span
+								<span in:fade={itemTransition} out:fade={itemTransition} class="min-w-0 truncate"
+									>{item.tooltip}</span
 								>
 							{/if}
 						</span>
@@ -171,9 +167,7 @@
 					: onSearchClick}
 			{@const itemTransition = {
 				duration: ICON_STRIP_TRANSITION_DURATION,
-				delay: !initialized
-					? ICON_STRIP_TRANSITION_DELAY_MULTIPLIER + i * ICON_STRIP_TRANSITION_DELAY_MULTIPLIER
-					: 0,
+				delay: !initialized ? i * ICON_STRIP_TRANSITION_DELAY_MULTIPLIER : 0,
 				easing: circIn
 			}}