feat: localised page title

[maanlamp]

Closes #48.

Replaces hook-based title management with TanStack Router's head() API and adds full i18n URL routing.

Page titles
Page titles are now set via head() on each route and rendered by <HeadContent /> in the root layout. A makePageTitle helper (src/lib/title.ts) appends · Template to every title, with the app name and delimiter configurable at the top of that file.

Localised URL segments
Auth routes are translated per locale via urlPatterns in the Paraglide Vite plugin:

Route	nl-NL	en-US
/login	/inloggen	/login
/forgot-password	/wachtwoord-vergeten	/forgot-password

deLocalizeUrl/localizeUrl in router.tsx automatically map these to TanStack Router's internal paths.

Root route head

• beforeLoad calls shouldRedirect() to redirect first-time visitors to their locale-specific URL.
• head() injects <link rel="canonical"> pointing to the nl-NL (base locale) version of every page.

Visuals

Notice the tab is showing the English title, URL and content

[maanlamp]

Alright, thanks for the feedback everyone; message received 😅. I've removed all of the "fancy" stuff, and have just left the static translated page titles.

I did look into how translating the actual url works, and its... not great. What do we think? Also too much for this PR?

		plugins: [
			paraglideVitePlugin({
				project: "./project.inlang",
				outdir: "./src/lib/paraglide",
				strategy: ["url", "localStorage", "baseLocale"],
				emitTsDeclarations: true,
				urlPatterns: [
					{
						pattern: "/login",
						localized: [
							["en-US", "/login"],
							["nl-NL", "/inloggen"],
						],
					},
					{
						pattern: "/forgot-password",
						localized: [
							["en-US", "/forgot-password"],
							["nl-NL", "/wachtwoord-vergeten"],
						],
					},
				],
			}),
		]

Stale

[Atchferox]

one small addition we could do

[maanlamp]

Looks like all feedback was implemented by Jorn already, so I didn't have to do anything :)

If I get a green light I'll merge.