gui: stack consumers page stream blocks full-width (fix table overflow) (#118)

The 7-column consumer tables were rendering inside the shared `.cols`
multi-column grid (minmax 240px), causing every table to overflow its
card horizontally — right-hand columns and Delete buttons appeared
outside the card border, visually detached from their rows.

Fix: replace `.cols` with a new `.consumer-streams` flex-column
container (consumers_list.html only) so each stream block is full-width
and stacked vertically.  Added a `.consumer-table-wrap` div with
`overflow-x: auto` as a safety net for narrow viewports.  The shared
`.cols` class and the streams page are untouched.  All existing content
is preserved: 7 columns, None-guards (em dash), the `central-owned`
label for archive-* consumers (no Delete button), the red Delete form +
CSRF for deletable consumers, the legend, and the "(no consumers)"
empty state.

Version bump 0.14.7 → 0.14.8.

Co-authored-by: Ubuntu <zvx@cortex.echo6.co>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "central"
-version = "0.14.7"
+version = "0.14.8"
 requires-python = ">=3.12,<3.13"
 description = "Data hub spine — adapters, bus, archive."
 readme = "README.md"