Add tab/project quick-switch dropdowns to the project breadcrumb

The project header breadcrumb now always shows the active tab
(previously Overview was hidden), and both the project-name and
tab-level crumbs become dropdowns: project name lists all projects
(with a checkmark on the active one, plus "All Projects"), and the
tab crumb lists Overview/Shots/Assets/Tasks/Schedule/Settings with a
checkmark on the current tab. The trailing ">" separator is skipped
after any crumb that renders as a dropdown.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

frontend/src/services/breadcrumb.ts

@@ -7,6 +7,10 @@ export interface BreadcrumbItem {
   label: string
   href?: string
   isActive?: boolean
+  /** True for the crumb representing the current project tab (Overview/Shots/Assets/...), so the header can render a tab-switcher dropdown on it. */
+  isTabCrumb?: boolean
+  /** True for the crumb representing the current project name, so the header can render a project-switcher dropdown on it. */
+  isProjectCrumb?: boolean
 }
 
 export class BreadcrumbService {
@@ -33,7 +37,8 @@ export class BreadcrumbService {
         // Add project breadcrumb
         crumbs.push({
           label: project ? project.name : `Project ${projectId}`,
-          href: `/projects/${projectId}`
+          href: `/projects/${projectId}`,
+          isProjectCrumb: true
         })
 
         // Handle tab-based navigation
@@ -45,7 +50,8 @@ export class BreadcrumbService {
           if (tab === 'shots' && route.params.episodeId) {
             crumbs.push({
               label: tabLabel,
-              href: `/projects/${projectId}/shots`
+              href: `/projects/${projectId}/shots`,
+              isTabCrumb: true
             })
             
             // Add episode context
@@ -66,11 +72,12 @@ export class BreadcrumbService {
                 })
               }
             }
-          } else if (pathSegments[2] || tab !== 'overview') {
-            // Regular tab navigation (don't show Overview in breadcrumbs unless explicitly navigated to)
+          } else {
+            // Regular tab navigation (Overview included, so the trail always reads Home > Project > Tab)
             crumbs.push({
               label: tabLabel,
-              isActive: true
+              isActive: true,
+              isTabCrumb: true
             })
           }
         }
@@ -85,7 +92,8 @@ export class BreadcrumbService {
               if (crumbs.length > 1) {
                 crumbs[crumbs.length - 1] = {
                   label: 'Shots',
-                  href: `/projects/${projectId}/shots`
+                  href: `/projects/${projectId}/shots`,
+                  isTabCrumb: true
                 }
               }
               crumbs.push({