feat(ui): collapsible sidebar, build version, unified table rows

[schronck]

Stacked on #209 (base feat/ui/mock-mode) — review/merge after it. Developed against mock mode.

Changes

Collapsible sidebar

• Chevron toggle collapses the sidebar to a 56px icon rail (orange "B" mark, icon-only nav with count badges, logout); content slides over to reclaim width. State persisted in localStorage.

Always-on build version

• Build version + date shown at the bottom of the expanded sidebar (e.g. v0.1.10 · 2026-06-22 14:54). Version injected from the crate version (build.rs → APP_VERSION → vite __APP_VERSION__), with a Cargo.toml fallback so npm run dev / mock mode also show the real version.
• Removed the Logo easter egg (5-click build-date reveal + 10-click /swagger-ui/ redirect). Swagger remains at /swagger-ui/.

Unified table row heights

• Every list row is a uniform 48px (theme MuiTableCell height) regardless of whether it carries a copy button / chip or just text — fixes the shorter Config-peers and DAR-compare rows. Normalized outlier per-cell paddings. Collapsible audit-detail rows opt out via height: auto.

Large-screen layout

• Content stays full-width / edge-to-edge (no centered cap). On large monitors the leading/trailing table cells gain horizontal padding (40/80/140px at ≥1536/1920/2400px) so content has breathing room from the edges, while row rules + zebra fills stay full-bleed.

Notes

• build.rs now passes APP_VERSION to the frontend build (only change outside frontend/).
• Verified in mock mode: all tabs/dialogs render, no console errors, build green, lint unchanged (51 pre-existing).

🤖 Generated with Claude Code

[schronck]

Folded into #212 — consolidating the UI modernization into a single PR. These commits are already included in #212.