supabase / supabase-flutter / 27912627757

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chore(supabase_lints): enable proper-super-calls, avoid-casting-to-extension-type, no-equal-switch-case (#1432)

Stacked on #1430.

## What

Enables three more rules — all with real fixes, no inline ignores:

### `proper-super-calls`
`super.initState()` now comes first in the example and test `State`
classes (`supabase_flutter/example/lib/main.dart` x2,
`widget_test_stubs.dart`).

### `avoid-casting-to-extension-type`
- `gotrue/broadcast_web.dart`: `message.jsify() as JSAny` ->
`message.jsify()!` (a null assertion, not an extension-type cast).
- `supabase/example/web/main.dart`: dropped the `as web.HTMLDivElement`
cast entirely — `textContent` is an `Element` member, so the value from
`querySelector` is used directly.

### `no-equal-switch-case`
- `SupabaseStreamBuilder`: combined the identical `timedOut` /
`channelError` cases.
- `convertCell` (`transformers.dart`): the converted cases plus the
pass-through cases already cover all 24 `PostgresTypes` values, so I
folded `case null:` into the pass-through group and removed the
duplicate `default`. This keeps the documented per-type cases and needs
no ignore.

Also removes a redundant `this.` qualifier (`endPointURL`) left over
from the earlier `queryParameters` rename.

## Verification
- `dcm analyze packages` -> no issues found (no unused ignores).
- `dart analyze` clean across all packages including infos; `flutter
analyze --fatal-warnings` clean.
- Tests: supabase 83, supabase_flutter 49, realtime transformers 19
pass.

2 of 2 new or added lines in 2 files covered. (100.0%)

4079 of 4788 relevant lines covered (85.19%)

3.49 hits per line