[stretch0]

What changed

• Club page header: Manage now sits on the same row as "← Clubs", as a smaller button. The logo and name are centred on each other, and the name has the full width, so "Regent's Park Runners" fits on one line at phone width. Before, Manage was pinned to the top while the logo was centred against a two-line name, so the three were at different heights.
• Clubs list: "Join with a code" is folded into a small "Have a code? Join a club" link, which opens the form with the input focused. People with no clubs still see the form straight away. Most people join from an invite link; the code is for reading out at the start of a run.
• Back links: the "←" character sat low against the text. A shared BackLink now draws the arrow as an icon, centred on the label, on all six pages that have one.
• The code input's placeholder is no longer forced to capitals ("E.G. K7MPQ2RX").
• Sign-in page scrolling: full-height pages use min-h-svh instead of min-h-dvh. On Firefox for Android with the address bar at the bottom, dvh can resolve to the height with the toolbar hidden, so the sign-in page scrolled by the toolbar's height even though nothing overflowed. svh is the height with the toolbar showing, so it always fits. The bottom nav is fixed, so the app layout is unaffected.
• Sign out: the button now says "Signing out…" and shows why it failed instead of failing silently. Better Auth returns errors rather than throwing, so a failed sign-out used to look like nothing happened.

Checks

• web lint, typecheck, unit tests and build pass; e2e: 12 passed.
• Checked in a local demo instance at phone width in dark mode. The scroll couldn't be reproduced in desktop Chromium, so the sign-in fix still needs checking on the phone.

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