More efficient flat file list format and various UX improvements (#3)

This is a major upgrade with assorted things included.

- Navigation flows improved, search appears in URL history, cleared when navigating to another folder
- More efficient file list format for faster loads
- Efficient updates, never re-send full root another time (except at connection)
- Large number of watching and filelist updates (inotify issues remain)
- File size coloring
- Fixed ZIP generation random glitches (thread race condition)
- Code refactoring, cleanup, typing fixes
- More tests

Reviewed-on: #3

README.md

@@ -1,6 +1,7 @@
 # Web File Storage
 
 Run directly from repository with Hatch (or use pip install as usual):
+
 ```sh
 hatch run cista -l :3000 /path/to/files
 ```
@@ -8,16 +9,17 @@ hatch run cista -l :3000 /path/to/files
 Settings incl. these arguments are stored to config file on the first startup and later `hatch run cista` is sufficient. If the `cista` script is missing, consider `pip install -e .` (within `hatch shell`) or some other trickery (known issue with installs made prior to adding the startup script).
 
 Create your user account:
+
 ```sh
 hatch run cista --user admin --privileged
 ```
 
 ## Build frontend
 
-Prebuilt frontend is provided in repository but for any changes it will need to be manually rebuilt:
+Frontend needs to be built before using and after any frontend changes:
 
 ```sh
-cd cista-front
+cd frontend
 npm install
 npm run build
 ```