Provide clear identification for trace files

Display relevant trace details at the top of each analysis tab. This makes it easier to recall what you're looking at when several trace files are open and you're comparing tabs. Showing only the trace file name is not enough since file names could be insufficiently detailed or not human-readable (difficult to remember).

* A concise, detailed trace label could include:
* **File name**
* **System information** (OS, kernel version, etc.) from traced system
* **Time** trace was captured (start time, end time, duration?)
* Also allow users to rename tabs? (to more intuitive tab title)


Start by locating the analysis tabs and their current trace-file titles in the trace viewer. Review what trace metadata is already available for the file name, traced system, and capture time, then determine how tab renaming should relate to the proposed label. Done means open traces can be distinguished reliably across tabs and the final tab-label behavior is documented and tested.

Written by the indexing model from the issue text.