solid-v2: dim user pages with isPending during navigation

[brenelz]

Applies the v2 pending-navigation pattern to the user detail pages in basic, fullstack, and fullstack-tanstack: dim the section to 0.5 opacity with isPending while a navigation refreshes the async user data, and in fullstack-tanstack also drop the artificial 1s delay in the getUser server function.

Originally this PR also carried the solid/tanstack prerelease bumps, but those landed directly on main (along with the typed-argument mutation reshape), so it's been rebased down to just the UI changes on top of that shape.

Verified against current main: pnpm run build succeeds in all three templates and the fullstack-tanstack vitest suite passes (10 tests).

(The earlier note here about useMutation's STRICT_READ_UNTRACKED warning is resolved upstream via TanStack/query#11325, which flight-scopes the mutation-cache subscription.)

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[socket-security]

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[ryansolid]

Heads up — main moved under this one today: the version bumps here (solid rc.4, vite-plugin next.35, @solidjs/router next.19, tanstack solid-router rc.4 + router-plugin 1.168.35, solid-query 6.0.0-rc.1) all landed directly on main, along with a reshape of the fullstack-tanstack mutations to typed arguments (validated end-to-end against the published packages). So this will conflict on every manifest/lockfile.

The unique part is worth keeping though: the v2 pending-navigation pattern on the user detail pages (direct async reads + isPending dimming instead of <Show> gating) and dropping the artificial delay. Suggest rebasing this down to just those UI changes — note fullstack-tanstack/src/routes/users.$id.tsx and lib/users.ts changed on main (typed-arg mutations, no more FormData), so the pattern would apply on top of that shape.

Also FYI on the note in the description: the STRICT_READ_UNTRACKED fix went a different route than TanStack/query#11324 — the mutation-cache subscription is now flight-scoped (created per mutation run, torn down at settle), see TanStack/query#11325.

[brenelz]

Updated. Yeah I thought maybe having an example of isPending would be good to have in the templates. Not required by any means