feat(projects): section headings you can count at a glance, and an Inbox that speaks the language

Two from use.

Section headings were small uppercase text over a hairline — a heading you have to
look for. A project with four sections is four groups, and the eye should be able
to count them without reading a word, so the heading gets a ground of its own and
the rows sit against the page. `--surface` rather than a tint of the accent: the
colour on that page belongs to the project, and a section is not a second thing to
colour. A step in lightness separates them in all five themes without anybody
measuring anything.

And the Inbox. The server names it at account creation, before anybody has seen a
settings page, so it is the one project name nobody chose — and an account made in
Danish went on saying "Indbakke" inside an English interface, which reads as a
string somebody forgot to translate. It was. `projectName()` translates it while it
still carries the name the server gave it; rename it and that is your name for it,
in every language, like any other project. The rename field keeps the raw name, or
editing a translated label would save the translation.

The screenshot set gains the list view, which is where sections read as bands
rather than as columns — and the shape most people actually work in.

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

web/src/lib/components/TaskDetail.svelte

@@ -11,7 +11,7 @@
 	 * necessarily the last one sent.
 	 */
 	import { api, humanMessage } from '$lib/api.js';
-	import { app } from '$lib/stores.svelte.js';
+	import { app, projectName } from '$lib/stores.svelte.js';
 	import { focusOnMount } from '$lib/focus.js';
 	import { t } from '$lib/i18n.svelte.js';
 
@@ -436,7 +436,7 @@
 				<label for="project">{t('detail.project')}</label>
 				<select id="project" bind:value={projectId} onchange={saveProject}>
 					{#each app.projects as project (project.id)}
-						<option value={project.id}>{project.name}</option>
+						<option value={project.id}>{projectName(project)}</option>
 					{/each}
 				</select>
 			</div>