feat(frontend): show a relay type filter chip and clarify the top consensus weight limit

[JuliusHenke]

What

Follow-up to #617: relay types become a visible limit like the search and the top consensus weight, and the related texts are clarified.

• A relay type filter chip next to the other chips combines all hidden relay types ("Only Guard: 1200/9168 relays", "No relay types: 0/9168 relays"). Removing it shows all relay types again.
• The settings group "Show relay types" is renamed to "Relay types". The relay type icon, painted in its color, replaces the round color swatch and opens the native color picker. The switch label is only the name.
• "Show only the heaviest" is renamed to "Show top" and its chip to "Top consensus weight: X/Y relays".
• While the limit is active, the marker tooltip says that the share is relative to the shown relays: "(1.23% of the top 50 consensus weight)".
• The relay type switches are described by their tooltip instead of being named after it, so their accessible names are Exit, Guard and Other.

Testing

• yarn tsc --noEmit, yarn lint clean.
• yarn test:run: 326 tests pass, with new tests for the chip (hidden types, restore, none shown), the heading and icon, and the tooltip text with and without a limit.
• Not reviewed visually with real data beyond what was shared during development.

No backend change, no dependency change, no deployment notes.

🤖 Generated with Claude Code

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