Use the card view's inline back arrow on every other heading

Generalized .card-view__back into .title-back and applied it to:

- ProjectView: arrow back to the dashboard, inline before the title
  (previously no back link at all here -- the app bar's brand already
  covers it, but this is more discoverable and matches the others).
- ProjectConfigureView: arrow back to the project, replacing the
  separate "Back to project" button that used to sit in the actions
  corner next to Manage.
- ProfileView: arrow back to the dashboard, replacing the plain-text
  link removed in an earlier commit.

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

web/src/views/ProjectView.vue

@@ -142,7 +142,10 @@ async function onCreate() {
 
     <template v-else-if="project">
       <div class="project-head">
-        <h1 class="project-head__title">{{ project.title }}</h1>
+        <h1 class="project-head__title">
+          <RouterLink :to="{ name: 'dashboard' }" class="title-back" aria-label="Back to dashboard">&larr;</RouterLink>
+          {{ project.title }}
+        </h1>
 
         <div class="project-head__actions">
           <ProjectManageMenu