fix(dashboard): render update_meta_inputs + schedule_prompt approval cards

Both kinds fell through to the spawn branch in renderApprovals, showing
a misleading 'spawn' chip and agent-spawn body text. Mara saw a meta-input
bump render as a spawn card for agent damocles and denied it.

Backend (dashboard.rs):
- Add commit_ref: None to the MergeConfigPr arm (struct was incomplete).
  All arms of ApprovalView now initialise every field.

Frontend (call.js):
- Add isUpdateMeta / isSchedule booleans alongside the existing kind flags.
- Glyph: update_meta_inputs gets ↻, schedule_prompt gets ⏱.
- Kind chip: 'meta-update' / 'schedule' (no kind-spawn class for either).
- Body: update_meta_inputs parses commit_ref as JSON Vec<String> and shows
  'bump flake inputs: foo, bar' or 'bump all flake inputs'; schedule_prompt
  parses SchedulePromptPayload and shows targets + first-fire time + cadence
  + a truncated body excerpt.
- History row: add 'meta-update' and 'schedule' cases (were both 'spawn').
- Import fmtDuration from util.js (needed for schedule cadence display).

hive-c0re/src/dashboard.rs

@@ -448,6 +448,13 @@ struct ApprovalView {
     /// sha. `None` for every other kind.
     #[serde(skip_serializing_if = "Option::is_none")]
     pr_number: Option<u64>,
+    /// Raw `commit_ref` payload for `UpdateMetaInputs` (JSON-encoded
+    /// `Vec<String>` of input names; `"[]"` = all inputs) and
+    /// `SchedulePrompt` (JSON-encoded `SchedulePromptPayload`). The
+    /// frontend parses this to render a human-readable card body.
+    /// `None` for every other kind.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    commit_ref: Option<String>,
     /// Unix seconds the approval was queued. Rendered as a relative
     /// time on the card so the operator can spot a stale request.
     requested_at: i64,
@@ -909,6 +916,7 @@ async fn build_approval_views(approvals: Vec<Approval>) -> Vec<ApprovalView> {
                     diff: Some(diff),
                     description: a.description,
                     pr_number: None,
+                    commit_ref: None,
                     requested_at: a.requested_at,
                 }
             }
@@ -920,6 +928,7 @@ async fn build_approval_views(approvals: Vec<Approval>) -> Vec<ApprovalView> {
                 diff: None,
                 description: a.description,
                 pr_number: None,
+                commit_ref: None,
                 requested_at: a.requested_at,
             },
             hive_sh4re::ApprovalKind::InitConfig => ApprovalView {
@@ -930,6 +939,7 @@ async fn build_approval_views(approvals: Vec<Approval>) -> Vec<ApprovalView> {
                 diff: None,
                 description: a.description,
                 pr_number: None,
+                commit_ref: None,
                 requested_at: a.requested_at,
             },
             hive_sh4re::ApprovalKind::UpdateMetaInputs => ApprovalView {
@@ -940,6 +950,7 @@ async fn build_approval_views(approvals: Vec<Approval>) -> Vec<ApprovalView> {
                 diff: None,
                 description: a.description,
                 pr_number: None,
+                commit_ref: Some(a.commit_ref),
                 requested_at: a.requested_at,
             },
             hive_sh4re::ApprovalKind::SchedulePrompt => ApprovalView {
@@ -950,6 +961,7 @@ async fn build_approval_views(approvals: Vec<Approval>) -> Vec<ApprovalView> {
                 diff: None,
                 description: a.description,
                 pr_number: None,
+                commit_ref: Some(a.commit_ref),
                 requested_at: a.requested_at,
             },
             hive_sh4re::ApprovalKind::MergeConfigPr => {
@@ -971,6 +983,7 @@ async fn build_approval_views(approvals: Vec<Approval>) -> Vec<ApprovalView> {
                     diff: None,
                     description: a.description,
                     pr_number,
+                    commit_ref: None,
                     requested_at: a.requested_at,
                 }
             }