feat(navigator): show player limits in the blue titan palette

[TheMeinerLP]

Stacked on #419 (fix/navigator-task-names); merge that first, or retarget this PR once #419 lands.

Changes

• Destination lore shows current/max (e.g. 12/100) instead of N online. When the provider reports no max (0) only the current count is shown; an unknown count still adds no line.
• TaskPlayers returns the task's PlayerCount (online and max, summed over running services) instead of a bare int. PlayerCount already carried max, so no core/common/bridge type changed.
• Navigator palette in the Titan blue/white family: inventory title, spawn entry, hotbar feather and each destination name are gradients, varied per destination. The count uses the Titan gradient, the slash is gray.
• Click handling is unchanged.

Tests

• DestinationPlayerLoreTest: current/max, current only (max 0), zero, gray slash, unknown adds no line.
• TaskPlayersTest, NavigatorPlayerCountTest: switched to the PlayerCount API and N/100 lore.
• NavigatorDestinationTest: Slender letter colors now #00b4d8 to #caf0f8.
• NavigatorModuleTest: spawn name compared as plain text, since its color changed.

https://claude.ai/code/session_01GXose9rakuRNZoM3TP3xj1

[github-actions]

Test results

  894 files    894 suites   41m 17s ⏱️
2 403 tests 2 401 ✅  2 💤 0 ❌
7 237 runs  7 154 ✅ 83 💤 0 ❌

Results for commit e20e57e.

[TheMeinerLP]

Superseded by #450: the navigator now shows online/max and uses per-mode gradients chosen in the navigator refresh. A palette-only change can be reopened on top of main if wanted.