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studio: ColumnTypeRef cascade + FK type comparison fixes (2/7) (#45903)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Refactor + bug fixes (part of the SafeSql migration stack — PR 2 of 7,
stacks on top of #45897).

## What is the current behavior?

- `pgMeta.columns.create` and the table-editor SQL builder take column
type as a string with array suffix and schema baked in (e.g.
`'private.test_enum'`, `'int4[]'`).
- The studio table-editor SQL emits the legacy schema-embedded `format`
string for enums in non-public schemas, while the pg-meta columns SQL
already returns the new shape (bare `format` + separate
`format_schema`). The two queries disagree on how to represent the same
column, surfacing as a false-positive type mismatch in the FK selector
when both ends are an enum from a non-public schema.
- The FK selector compares column types by `format` alone — same-named
enums in different schemas appear equal, and arrays vs. scalars of the
same base type pass the family check.
- `displayColumnType` renders arrays as the raw `_typname` pg-meta emits
(e.g. `_int4` instead of `int4[]`).

## What is the new behavior?

**pg-meta**

- Introduce `ColumnTypeRef` (`{ schema?, name, isArray? }`) for column
type input, replacing the legacy string-with-array-suffix format.
`pgMeta.columns.create` and the table-editor SQL builder consume the new
shape.
- Add `format_schema` to the column zod schema; pg-meta SQL emits the
type's schema for the table editor's ColumnType dropdown.
- `pgMeta.columns.create` returns a `SafeSqlFragment`.
- Studio table-editor SQL now emits bare `format` + `format_schema`,
matching pg-meta's columns SQL.

**Studio**

- `SafePostgresColumn`/`SafePostgresTable` extend the new `PG*` types
(master dropped postgres-meta).
- Pipe `ColumnTypeRef` through `SidePanelEditor` → `ColumnEditor` →
`TableEditor`, along with the column-c... (continued)

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