[FEATURE]: Notify users of available updates when auto-update is disabled

[Ravi-AIML]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Problem

When autoupdate: false, users are never notified about new versions.

Proposed Solution

Show a toast notification when a new version is available (even if auto-update is disabled):

• Message: "New version v{version} available. Run 'opencode upgrade' to update."

Benefit

Users with auto-update disabled can still be informed about updates and choose when to upgrade manually.

[rekram1-node]

Yeah that makes sense, also I think our toasts for updating aren't working for whatever reason

[rekram1-node]

Would accept PR here, it is easy to mock updates because you can just emit the mock update event to the bus and the tui and backend will both be aware of it

[Raviguntakala]

Yeah that makes sense, also I think our toasts for updating aren't working for whatever reason

I have fixed the toast message issue and raised PR #4625

[jdanbrown]

✋ Actually, I find these toasts really annoying. I set "autoupdate": false and I personally don't want to see the Update available toast every time I start opencode (it's very distracting). I'd rather poll for updates myself, and manage them with my own process.

Also, I'd expect that IT teams managing opencode across a corporate fleet don't want this toast either, since they'll want to slow-roll their own update cadence, which means they'll always be some number of versions behind, by design (e.g. a common line of defense against supply-chain attacks). So their users would just see these toasts 100% of the time and not be able to do anything about them — lose-lose in that case.

If we do think these toasts are useful, maybe add another config flag so users can opt to disable them?

[rekram1-node]

@jdanbrown how about I change it to "notify" where we keep the old behavior but people can opt into getting notified and not upgraded

[jdanbrown]

Do you mean like "autoupdate": true | false | "notify"? Yep, that would solve my use case.

[rekram1-node]

Yessir

[rekram1-node]

@jdanbrown fixed in next release: a9a2c23