[albertospelta]

Every AppEnvironment.AddDiagnostics call is now a [LoggerMessage] method;
static call sites log in their caller or take an ILogger. AddDiagnostics,
IsDiagnosticLevelVerbose, AppEnvironment.Diagnostics and DiagnosticMessage
are removed.

DiagnosticLevelSwitch carries the user's diagnostic level into a logger filter
rule: the pane store receives Information only at Verbose, while Microsoft and
System categories stay at Warning. The bootstrap applies the saved level and
UpdateOptions applies a changed one after every save attempt.

DiagnosticLogStore keeps the last 1000 records, bounded by text size too,
with template, placeholder values and the exception chain (aggregate inners
and the properties each exception type adds). GetDiagnostics takes a cursor
and a maximum count instead of marking records as read, so a reload of the
pane loses no host record. The pane polls at every level except None, shows
JSON values as a tree and highlights records with an exception.

The catch-all problem details mapping no longer logs, since the middleware
logs 500 responses; mapped exceptions are logged and tracked through one
method. The per-message copy redacts the same five sensitive tags as
telemetry, and a test keeps the two tag lists aligned.