feat: bump leptos 0.7→0.8 + axum 0.7→0.8

[satyakwok]

Cluster C of the major-bump audit.

Changes

• leptos 0.7 → 0.8 (core, _meta, _router, _axum)
• axum 0.7 → 0.8

Verification

• cargo check --target wasm32-unknown-unknown — clean (browser/CSR/hydrate)
• cargo check --features ssr — clean (axum SSR binary)
• No source changes needed — leptos 0.8 view! macro + signal API stayed compatible with our usage

Note on axum lockfile entries

axum 0.7.9 still appears in Cargo.lock as a transitive of server_fn (which leptos 0.8 still pins to 0.7 internally); our crate links against 0.8.9. This dual-presence resolves once the leptos ecosystem fully migrates.

Coordination

Independent of cluster A (PR #25) — both touch Cargo.toml; whichever lands first will be a trivial rebase for the other.

Supersedes #17, #18, #20, #22.

Summary by CodeRabbit

• Chores
  • Updated framework and server runtime dependencies to newer versions for enhanced compatibility.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between cf6dbdf and 19ff18e.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock, !**/*.lock

📒 Files selected for processing (1)

• Cargo.toml

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📝 Walkthrough

Walkthrough

This PR updates the Sentrix Explorer project's dependencies to use Leptos 0.8 and Axum 0.8. The change modifies Cargo.toml to bump leptos, leptos_meta, leptos_router, and the optional leptos_axum from version 0.7 to 0.8, along with the optional axum server dependency from 0.7 to 0.8. All other configuration and dependency flags remain unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely summarizes the main change: bumping leptos from 0.7 to 0.8 and axum from 0.7 to 0.8, matching the changeset content.
Description check	✅ Passed	The description covers the main changes, verification steps, and relevant context. However, it deviates from the template by omitting a formal 'Summary' section and 'Test plan' checklist.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-leptos-axum

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