fix: only count preview branches toward the preview branch limit - #4283

## Summary
5 improvements, 5 bug fixes.

## Improvements
- Add experimental Node.js 24 and 26 task runtimes. Set `runtime` to
`experimental-node-24` or `experimental-node-26` in `trigger.config.ts`.
([#4085](#4085))
- Add `defaultRegion` to the project GET and list API responses; null
when unset.
([#4146](#4146))

## Server changes

These changes affect the self-hosted Docker image and Trigger.dev Cloud:

- Transient internal sync failures are now retried quietly instead of
surfacing as errors.
([#4270](#4270))
- Optionally route ClickHouse read traffic to a read replica while
writes stay on the primary. Set `CLICKHOUSE_READER_URL` to move all
reads, or target the busiest paths with `RUNS_LIST_CLICKHOUSE_URL` (runs
list) and `EVENTS_READER_CLICKHOUSE_URL` (traces, spans, logs). All
optional; unset keeps current behavior.
([#4081](#4081))
- Remove the deprecated realtime stream write endpoint used by retired
v3 task clients.
([#4250](#4250))
- Fix batchTrigger requests that set a per-item idempotency key failing
with an error instead of creating and deduplicating the runs
([#4271](#4271))
- Speed up idempotency checks on `batchTrigger` calls that use
idempotency keys. Large batches against a task with a big run history no
longer degrade to multi-second lookups.
([#4255](#4255))
- The "Preview branches" usage on the Limits page now counts only
preview branches.
([#4283](#4283))
- Avoid opening a redundant database connection pool when the legacy and
primary databases are the same server, preventing connection usage from
doubling.
([#4253](#4253))
- Fix pages occasionally loading unstyled or failing to load during a
deploy. The dashboard now reloads automatically to recover.
([#4282](#4282))

<details>
<summary>Raw changeset output</summary>

# Releases
## @trigger.dev/build@4.5.5

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.5`
## trigger.dev@4.5.5

### Patch Changes

- Add experimental Node.js 24 and 26 task runtimes. Set `runtime` to
`experimental-node-24` or `experimental-node-26` in `trigger.config.ts`.
([#4085](#4085))
- Updated dependencies:
  - `@trigger.dev/core@4.5.5`
  - `@trigger.dev/build@4.5.5`
  - `@trigger.dev/schema-to-json@4.5.5`
## @trigger.dev/core@4.5.5

### Patch Changes

- Add experimental Node.js 24 and 26 task runtimes. Set `runtime` to
`experimental-node-24` or `experimental-node-26` in `trigger.config.ts`.
([#4085](#4085))
- Add `defaultRegion` to the project GET and list API responses; null
when unset.
([#4146](#4146))
## @trigger.dev/python@4.5.5

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.5`
  - `@trigger.dev/build@4.5.5`
  - `@trigger.dev/sdk@4.5.5`
## @trigger.dev/react-hooks@4.5.5

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.5`
## @trigger.dev/redis-worker@4.5.5

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.5`
## @trigger.dev/rsc@4.5.5

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.5`
## @trigger.dev/schema-to-json@4.5.5

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.5`
## @trigger.dev/sdk@4.5.5

### Patch Changes

- Updated dependencies:
  - `@trigger.dev/core@4.5.5`

</details>

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>