fix(flows): only offer install for capabilities the store resolves

The capability set behind the flow editor's Install quick-fix and
the flow list's install badge ingested every store entry's
requiresCapabilities (dependencies, not provided capabilities) and
ignored entry status/kind. Clicking Install on such a capability
ended in the hub's "no store entry for '<name>'" error.

The set now mirrors the hub's install resolver (entry names only,
no planned or federated entries) via installableStoreCapabilities()
with unit tests for both classification states. Unresolvable
capabilities render the editor's 'not in store' state, which
explains the three recovery paths before any click; the editor pin
moves to 0.25.0 (commit-pinned until its tag exists) and the dialog
harness captures the badge states light+dark. Studio 0.78.0.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/data/about_info.dart

@@ -4,7 +4,7 @@
 
 /// Studio's own build version. Bump on every UI release so the
 /// running app self-identifies.
-const String kStudioVersion = '0.77.0';
+const String kStudioVersion = '0.78.0';
 
 const String kProductName = 'Ch∆In Studio';
 const String kVendorName = 'Flemming.AI (F∆I)';