Panics · P02 Typography: Link takes its handler, an unknown zone reads as UTC and says so, a long highlight query logs

AGENTS.md

@@ -190,7 +190,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - The gallery's pictures go through `asset!` and `ui::picture` or `ui::resource`: a file natively, on the web an address under `ELY_GALLERY_ASSETS`, since gpui reads no files there.
 - On the web a paste reaches the focused field as the browser's paste event, through `EntityInputHandler::paste`, so Paste stays unbound there (`TextInput`, `CodeEditor`). Code that reads the clipboard itself awaits `read_from_clipboard_async`: gpui_web's `read_from_clipboard` answers at once and finds nothing (`tables::DataGrid`'s Cmd-V).
 - The first frame wears the host's mode through `Theme::set_mode_now`, a mode sent before the window opens included; `set_mode` fades from the colors on screen.
-- The system time zone comes from `typography::format::system_zone`, which fails loud; jiff's `TimeZone::system()` falls back to UTC in silence.
+- The system time zone comes from `typography::format::system_zone`: an unknown zone logs one error naming the first component that asked and reads as jiff's `TimeZone::unknown()`, which is UTC. A time shown in the system zone goes through `typography::format::datetime`, which adds " UTC" in the unknown zone, so the screen never claims local time. jiff's `TimeZone::system()` falls back to UTC in silence.
 - A Select with nothing to pick stays shut: disabled, it shows its placeholder; open, it fails (`media::DeviceSelector` says no device was found).
 - A list opens with its cursor on the current choice: Select on the chosen row, Combobox on its value, MultiSelect on the first one ticked, SelectableList on its first selected row. A selection the owner makes, not the echo of the list's own pick, moves SelectableList's cursor there.
 - An event repeats as RFC 5545 has it: weeks count from the start's own week, and a month or a year without the start's date is passed over (`calendar::Recurrence`).