* feat(web): simplify Home composer (drop plugin-inputs form & example pill, move Design Agent next to Send)
- Remove the inline plugin-inputs form (ARTIFACT KIND / AUDIENCE / TEMPLATE) from the Home composer; required inputs no longer gate Send (defaults still flow to the backend).
- Remove the dismissible "selected example" pill above the editor; picking an example still seeds the prompt.
- Move the Design Agent toggle from the footer-left group to sit directly left of the Send button.
* fix(web): keep client-side required-input gate on Home composer
Dropping the inline plugin-inputs form left pluginInputsAreValid() always
returning true, so a required field with no default that the user blanks out in
an editable Home scenario kept Send enabled and only failed at click-time apply
with a generic "Failed to apply …" error (the daemon's validateInputs rejects
missing required inputs).
Restore a client-side gate that mirrors the daemon's required-input rule and
names the missing field in the submit error, so these Home flows fail fast.
Extracts the pure check into utils/pluginRequiredInputs with unit coverage.
* fix(web): drop example from active-row mount condition
With the example pill removed from the Home composer active row, keeping
selectedPromptExample in showActiveContextRow mounted an empty .home-hero__active
row when an example was picked with no other active context. Remove it from the
condition so the row only renders when it has visible content.
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Co-authored-by: qiongyu1999 <2694684348@qq.com>
Co-authored-by: lefarcen <935902669@qq.com>
