Missing and inconsistent page title tags

Several Svelte routes have missing or inconsistent <title> values.

Cases:

• Root page has no <svelte:head> title.
• Account settings title is Settings instead of branded.
• Project settings lacks final · Issues brand.
• Ticket page lacks separator/brand.

Suggested titles:

• Projects · Issues
• Settings · Issues
• {project.name} · Settings · Issues
• {KEY-N} {title} · Issues

Acceptance criteria:

• Update route head tags for consistent browser titles.
• Add lightweight tests if route/page head testing pattern exists.