refactor: collapse the table views into a generic TableView and drop dead code

[alvgaona]

Summary

Ponytail audit pass over the viewer. Same three panels, same status bar, same CLI, about 40% less source and two fewer direct dependencies. The Topics, Nodes and Diagnostics views were the same ViewClass, ViewState and visualizer copied three times; everything else here is smaller cuts the same audit turned up.

Changes

• src/views/table.rs is a generic TableView<S> / TableSystem<S> over a TableSpec trait; topics.rs, nodes.rs and diagnostics.rs are now 70–110 line specs (columns, descriptors, row parse, cmp, cell). The public TopicsView / NodesView / DiagnosticsView names survive as type aliases, so main.rs and web.rs registration is untouched. Start the review here.
• Sort headers draw re_ui::icons::ARROW_UP / ARROW_DOWN instead of a hand-painted triangle and take a column index instead of per-view enums.
• The visualizer no longer advertises rewire's untagged descriptors as queried, which removes the "won't show in the defaults ui" toast. queried only feeds the selection panel and visualizability is gated by constraints, which stays None.
• ControlServer is a control::spawn() function, the status bar's two count helpers are one latest_len, RelayLink::forward returns Option<bool>, and the bare use <crate>; lines are gone.
• rerun and re_types_core were unreferenced and are dropped. wasm-bindgen-futures stays with a comment, since the #[wasm_bindgen] expansion of async fn start names it.
• The web loader reassembles the wasm bytes with new Blob(chunks).arrayBuffer() instead of a manual copy loop.

Checklist

• PR title follows Conventional Commits
• cargo fmt --check is clean
• cargo clippy --all-targets -- -D warnings is clean (native)
• cargo build --lib --target wasm32-unknown-unknown --no-default-features builds (wasm) — ran cargo check for that target locally, leaving the full build to the build-wasm CI job
• cargo test passes
• Public items have /// docs

Breaking changes

Library API only. The icons and util modules and control::ControlServer are removed from the rewire_viewer crate. CLI flags, ports and the bridge/viewer protocol are unchanged.