The bug report template's version placeholder still shows 0.2.2

## What happens

`.github/ISSUE_TEMPLATE/bug_report.yml:38` uses `placeholder: "0.2.2"` for the Uttrflow version, and line 46 uses `"26.1"` for macOS. Releases moved to calendar versions with `2026.9.14` (see `RELEASING.md:20`), and the app requires macOS 26 or later.

## Why it matters

The placeholder is an example of what to type. An old semantic version suggests the reporter is looking in the wrong place, or that the project still ships that version.

## How to check

Open the "Bug report" form on the Issues page, or read lines 34-48 of the template.

## Acceptance criteria

- The version placeholder shows a calendar version in the current format, for example `2026.9.14`.
- The macOS placeholder shows a current macOS 26 version.
- The description ("The foot of the sidebar, or Uttrflow → About.") is still accurate; check it against the app or `Sources/UttrflowUX` and fix it if not.

## Where to start

- `.github/ISSUE_TEMPLATE/bug_report.yml`
- Tests to extend: none; `make verify` still has to pass.
- Before pushing, run `make verify` (export DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer first). It is the same command CI runs, and it enforces the 95% coverage floor per module.
- Read [CONTRIBUTING.md](https://github.com/uttrflow/uttrflow-swift/blob/main/CONTRIBUTING.md) first, and say on this issue that you are taking it.

**Size:** XS, under an hour.

Read CONTRIBUTING.md, then inspect .github/ISSUE_TEMPLATE/bug_report.yml lines 34-48 and compare the About location with the app or Sources/UttrflowUX. Update the version and macOS placeholders while keeping the description accurate, then run make verify with the specified DEVELOPER_DIR; done means the template reflects current formats and verification passes.

Written by the indexing model from the issue text.