GeezerVison

Add SQL round trip tests for VIRTUAL and STORED generated columns and a
test that Field/Table comparison notices changes to the generated column
definition (alterTable relies on it to detect modified tables).

Add an offscreen test (test-edit-table) which drives the Edit Table
dialog against a real database: showing, adding, changing and removing
generated columns, switching between VIRTUAL and STORED, adding a STORED
column to a table with data, and the primary key / default value
restrictions. These fail for now as the dialog has no support for
generated columns yet.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

Add a "Generated" column to the field list which holds the expression of
a generated column (empty for ordinary columns) and a "Stored" checkbox
column which switches the column from VIRTUAL, the default, to STORED.
Both are filled from the existing table and applied to the field when
edited. See sqlitebrowser#2107.

Generated columns can't be part of the primary key and can't have a
default value, so the dialog refuses these combinations. Turning an
existing column into a generated column replaces its data, so the user
has to confirm that first.

SQLite can't add a STORED column with ALTER TABLE ADD COLUMN, so
alterTable() now leaves those to the table rebuild it does anyway.

Field::operator== ignored the generated column constraint which made
alterTable() believe nothing had changed when only the generated column
expression or storage was edited. Compare it by value now.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

test-global-filter needs the CMake prefix paths on PATH on Windows
because the CI jobs build SQLite as a DLL there. test-edit-table links
SQLite too and would crash on Windows without them.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

The .ui files connect to slots that don't exist in Qt6 (QDialog::help)
unless uic generates string based connections. The main target already
sets this option for Qt6, but test-edit-table compiles the dialogs' .ui
files as well and would fail to build with Qt6.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

Link CipherDialog into test-edit-table, which sqlitedb.cpp needs when it
is built with SQLCipher. Skip the three tests that have the dialog show
a message box on Windows, where QMessageBox::showEvent() crashes with the
offscreen platform.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>