Release 4.5.1

Changes from 4.5.0 to 4.5.1

This follow-up release builds the b2view terminal viewer into a richer
data-exploration tool — a scatter plot, a searchable column picker, a
one-shot demo download, refreshed chrome, and several interaction fixes — and
upgrades the bundled C-Blosc2 to 3.1.4. WASM/Pyodide is now a fully
supported platform, and CTable.info reports per-column compressed sizes.

b2view: richer exploration

• Scatter plots: from a column plot, press s to scatter the current column
  (X) against another column (Y) chosen from a list, over the current (zoomed)
  row range; h then opens a high-resolution matplotlib scatter.
• High-res for 1-D series is now an envelope plot (matching the in-terminal
  view), and a new r key toggles between the min/max envelope and the raw
  values (strided-sampled when the range is wide).
• Searchable column picker: the c go-to-column key now opens a searchable,
  selectable list (type to filter, ↑/↓, Enter) for CTables, instead of a text
  field; N-D arrays still go by numeric index.
• Show/hide columns: / opens a searchable multi-select to pick which CTable
  columns are displayed.
• Demo download: b2view --download fetches a demo bundle
  (chicago-taxi-flat.b2z by default) into the current directory if it is not
  already there, then opens it.
• Refreshed chrome: a branded header, a left-docked filename label in the
  title, and clearer status chips.

b2view: interaction fixes

• Go-to-row/column pre-fill is now pre-selected, so the first keystroke
  replaces the current index instead of appending to it (typing a column name no
  longer produced e.g. 0payment.fare).
• Escape keeps its layered exit while a panel is maximized: with the data
  panel maximized, escape now unlocks a plot's locked row window (and clears
  filters) as documented, instead of being hijacked into restoring the panel —
  use r to restore (ESCAPE_TO_MINIMIZE = False).
• Test-suite robustness fixes (a timing flake and a Windows rendering glitch).

Other

• C-Blosc2 upgraded to 3.1.4.
• WASM/Pyodide is now a fully supported platform, with more frequent CI runs.
• CTable.info shows per-column compressed sizes (cbytes and cratio),
  and print_versions() uses clearer Python-Blosc2 / C-Blosc2 labels.