Updating ReadRange on ReadObject does not reset read_limit, causing data truncation or panic

Unconfirmed. This is the result of a search with Gemini, may be a false positive.

In `crate::model::ReadObjectRequest::with_range`, modifying `range` updates `read_offset` and `read_limit`:

https://github.com/googleapis/google-cloud-rust/blob/f02b42c2ac5720334cd2b5335824bd4166264527/src/storage/src/model_ext.rs#L286-L307

When a caller sets `ReadRange::head(100)` or `ReadRange::segment(offset, limit)` on a `ReadObject` request builder via `set_read_range`:

https://github.com/googleapis/google-cloud-rust/blob/f02b42c2ac5720334cd2b5335824bd4166264527/src/storage/src/storage/read_object.rs#L283-L286

`read_offset` is set to `0` and `read_limit` is set to `100`.

However, the `RequestedRange::Offset` and `RequestedRange::Tail` branches in `with_range` update `self.read_offset` without resetting `self.read_limit = 0;`:
1. If the caller subsequently calls `.set_read_range(ReadRange::all())` (or `ReadRange::offset(...)`), `read_limit` remains `100`. The download still requests only the first 100 bytes (e.g. `Range: bytes=0-99`) rather than downloading the entire object, causing silent data truncation.
2. If the caller subsequently calls `.set_read_range(ReadRange::tail(10))`, `read_offset` becomes `-10` while `read_limit` remains `100`. When constructing the HTTP request, this triggers an `unreachable!()` panic:

https://github.com/googleapis/google-cloud-rust/blob/f02b42c2ac5720334cd2b5335824bd4166264527/src/storage/src/storage/read_object.rs#L621-L625

`with_range` should reset `self.read_limit = 0;` when handling `RequestedRange::Offset` and `RequestedRange::Tail`.

Start in src/storage/src/model_ext.rs around ReadObjectRequest::with_range, then inspect set_read_range and HTTP range construction in src/storage/src/storage/read_object.rs. Check the Offset and Tail cases against the Head, Segment, and All transitions. Done means switching ranges no longer truncates an All or Offset request and no longer reaches the documented panic for Tail.

Written by the indexing model from the issue text.