Name a nearly full disk when a back end start fails, and check the drive under Podman on Windows

CHANGELOG.md

@@ -20,6 +20,18 @@ Newest first. `Unreleased` is what is on `main` and not yet tagged.
   Downloads sync now copies a prerelease asked for by tag (its images and its own files, never
   `latest/`), and each scheduled run copies the images of every prerelease newer than Latest from
   the last 30 days. Drafts are never copied.
+- **A back end start that fails on a nearly full disk says so, with the numbers.** Relaunching a
+  used install whose back end's disk was nearly full said only "The back end stopped with an error
+  partway through." Each start, update and setup now checks the engine first and logs what it has
+  as `[local check]`, and a start that fails is checked again with the back end asked whether it is
+  short of disk. The card then says, for example, "The back end's disk is nearly full. Podman has
+  30.5 GB free of 1006.8 GB. OpenBot needs 40 GB. Free space on the drive that holds OpenBot's
+  engine (C:), then Retry." On Windows, free disk is measured on that drive, which can run out
+  while the machine itself shows hundreds of GB free, and the card never suggests
+  `podman machine set`, which WSL machines refuse. In the few minutes after space was freed, while
+  the back end still reports low disk, a start that fails, or a Retry that finds the back end
+  running but not healthy, says "The back end is recovering from low disk space. Wait a few
+  minutes, then Retry." where Retry said "The back end is running but not healthy."
 
 ## 1.0.0
 

desktop/src-tauri/Cargo.toml

@@ -84,7 +84,10 @@ objc2-av-foundation = { version = "0.3", default-features = false, features = ["
 
 # Narration on Windows: the SAPI in-process recognizer. See `speech/sapi.rs`. The version Tauri uses.
 [target.'cfg(windows)'.dependencies]
-windows = { version = "0.62", features = ["Win32_Foundation", "Win32_Globalization", "Win32_Media_Speech", "Win32_System_Com", "Data_Xml_Dom", "UI_Notifications", "Win32_UI_WindowsAndMessaging", "Win32_System_Threading"] }
+windows = { version = "0.62", features = ["Win32_Foundation", "Win32_Globalization", "Win32_Media_Speech", "Win32_System_Com", "Data_Xml_Dom", "UI_Notifications", "Win32_UI_WindowsAndMessaging", "Win32_System_Threading", "Win32_Storage_FileSystem"] }
+# Where WSL keeps a Podman machine's disk, so its drive's free space is checked before Start. See
+# `windows::podman_machine_drive`. The version reqwest already uses.
+windows-registry = "0.6"
 
 [dev-dependencies]
 tauri = { version = "2", features = ["test"] }