test: add end-to-end (e2e) tests for web

e2e/kane/.gitignore

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+.testmuai/
+output-*/

e2e/kane/README.md

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+# End-to-end (e2e) tests for web
+
+Browser tests written in plain English for [Kane CLI](https://www.testmuai.com/kane-cli/).
+
+| Test | What it covers |
+|---|---|
+| `setup_test.md` | Creating the first user and logging in |
+| `files_test.md` | First user and login, then creating a folder and a file |
+
+## Run
+
+Start a fresh instance on port 4900:
+
+```bash
+docker run -d --name filerise-e2e -p 4900:80 -e PERSISTENT_TOKENS_KEY=e2e-tokens-key error311/filerise-docker:latest
+npm install -g @testmuai/kane-cli
+kane-cli login
+kane-cli testmd run e2e/kane/setup_test.md
+kane-cli testmd run e2e/kane/files_test.md
+```
+
+Both tests start from the first-user form, so recreate the container before each run.

e2e/kane/files_test.md

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+---
+mode: testing
+url: http://localhost:4900/
+max_steps: 50
+---
+
+# Create a folder and a file
+
+## Create the first user and log in
+Type "samrivera" as the Username and "FileRise-Test-2026" as the Password, then click "Save User".
+Type "samrivera" as the User and "FileRise-Test-2026" as the Password, then click "Login".
+Verify the file list shows "Files in (root)".
+
+## Create a folder
+Click the "New" button above the file list, then click "Create Folder".
+Type "Projects" as the folder name and click "Create".
+Verify "Projects" appears under "Folder Navigation & Management".
+
+## Create a file
+Click the "New" button above the file list, then click "Create File".
+Type "notes.txt" as the file name and click "Create".
+Verify "notes.txt" is listed in the file list.

e2e/kane/setup_test.md

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+---
+mode: testing
+url: http://localhost:4900/
+max_steps: 30
+---
+
+# First user and login
+
+## Create the first user
+Verify the "Create New User" form is shown.
+Type "alexmorgan" as the Username and "FileRise-Test-2026" as the Password, check "Grant Admin Access", then click "Save User".
+Verify the "Please log in to continue" form is shown.
+
+## Log in
+Type "alexmorgan" as the User and "FileRise-Test-2026" as the Password, then click "Login".
+Verify the header shows "alexmorgan" and the file list shows "Files in (root)" with "No files found.".