fix(ui): use feature detection for crypto.randomUUID to support HTTP deployments - #1868

`crypto.randomUUID` was fixed once in #1868 and came back when the interface was
rewritten and the file holding the helper went with it. A note in a file is lost
the same way twice, so the rule states it where a rewrite cannot drop it, and
names the helper to use instead. `navigator.clipboard` is listed for the same
reason: bare, it fails silently rather than loudly.

Signed-off-by: Nicholas Bucher <[email protected]>

…ries (kagent-dev#2865)

---
*🤖 written by Claude (start)*

## Changelog

The UI now works when served over plain http from anything but
localhost, and one component throwing no longer blanks the page.

## Testing

1. `cd ui && yarn dev --host`, then open the printed **Network** URL — a
LAN IP, not localhost, so not a secure context.
2. `/schedules/new` loads and takes input. On `main` it throws
`crypto.randomUUID is not a function` at mount and stays blank.
3. Share a conversation and press **Copy link**. The button reports
whether it worked; on `main` it silently does nothing here.
4. Put `crypto.randomUUID()` back in `ScheduledRunForm.tsx` and reload.
The error renders inside the shell, nav usable, stack behind **Error
details**.

## Additional Notes

This reinstates kagent-dev#1868, which fixed the same crash in May. That fix lived
in `ui/src/lib/utils.ts` and went with the interface rewrite. The lint
rule is the part meant to outlast the next one.

`randomId()` returns a v4 UUID because the control plane validates some
of these ids as UUIDs. It uses `crypto.getRandomValues`, which carries
no secure-context condition.

The clipboard fallback answers the document's own `copy` event, as antd
does. antd's `copyable` UI is not used: it reports a copy whatever
`copy()` returns.

Not covered: a module that throws while being evaluated. `main.tsx`
never runs, so no boundary exists yet.

---
*🤖 written by Claude (end)*

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Signed-off-by: Nicholas Bucher <[email protected]>

---
*🤖 written by Claude (start)*

## Changelog

Copy buttons work on deployments served over plain http, and say so when
a copy fails.

## Testing

1. `cd ui && npm run dev`, then open the app on a LAN IP rather than
localhost — that origin is not a secure context, so
`navigator.clipboard` is undefined.
2. Expand a tool result and press copy. The tick appears and the
clipboard holds the result; before, nothing happened and nothing was
said.
3. Copy a code block, the LLM-call JSON, and a share link. Each reports
its outcome.

## Additional Notes

This is the other half of #1868, which fixed `crypto.randomUUID` for
these deployments and left the clipboard alone. That fix is already here
and needs no change.

`copyText` answers the document's own `copy` event rather than selecting
a borrowed textarea. Nothing needs focus, so it also works inside a
dialog that traps it — the share dialog's old fallback appended its
textarea to `document.body` and copied nothing there while reporting
success.

Success is the event having fired, not what `execCommand` returns: it
returns true for copying nothing.

---
*🤖 written by Claude (end)*

Signed-off-by: Nicholas Bucher <[email protected]>
Co-authored-by: Eitan Yarmush <[email protected]>

…ries (kagent-dev#2865)

Signed-off-by: alexdarbyshire <[email protected]>

---
*🤖 written by Claude (start)*

## Changelog

The UI now works when served over plain http from anything but
localhost, and one component throwing no longer blanks the page.

## Testing

1. `cd ui && yarn dev --host`, then open the printed **Network** URL — a
LAN IP, not localhost, so not a secure context.
2. `/schedules/new` loads and takes input. On `main` it throws
`crypto.randomUUID is not a function` at mount and stays blank.
3. Share a conversation and press **Copy link**. The button reports
whether it worked; on `main` it silently does nothing here.
4. Put `crypto.randomUUID()` back in `ScheduledRunForm.tsx` and reload.
The error renders inside the shell, nav usable, stack behind **Error
details**.

## Additional Notes

This reinstates kagent-dev#1868, which fixed the same crash in May. That fix lived
in `ui/src/lib/utils.ts` and went with the interface rewrite. The lint
rule is the part meant to outlast the next one.

`randomId()` returns a v4 UUID because the control plane validates some
of these ids as UUIDs. It uses `crypto.getRandomValues`, which carries
no secure-context condition.

The clipboard fallback answers the document's own `copy` event, as antd
does. antd's `copyable` UI is not used: it reports a copy whatever
`copy()` returns.

Not covered: a module that throws while being evaluated. `main.tsx`
never runs, so no boundary exists yet.

---
*🤖 written by Claude (end)*

---------

Signed-off-by: Nicholas Bucher <[email protected]>