DX: Job Reprioritization from build detail pane

[alexhraber]

Problem

The Buildkite CLI can reprioritize jobs (bk job reprioritize), but builddeck offers no way to change job priority from the TUI. When a critical build's job is stuck behind lower-priority work, users must drop to the CLI or browser to fix the ordering.

Proposed Feature

Add a job reprioritization action in the build detail pane (steps list). When a step is highlighted, pressing a key (e.g. p or ctrl+p) opens a small inline prompt to set a new priority value.

UX

Steps:
  PASS  :lint                    agent-1
  FAIL  :test                    agent-2  exit 1
> BLCK  :deploy                  [blocked]
  NRUN  :integration-tests

  → Press `p` → inline prompt: "Priority (0-1000): [500]"
  → Enter value → PUT to API → step refreshes with new priority

The prompt should appear in the status bar area (non-modal, keeping context visible):

Status: Enter new priority for :deploy (0-1000): [500]

Why this fits a TUI

• Job priority is a quick operational tweak — perfect for a keyboard shortcut
• The TUI already shows the full job list with state badges; priority is a natural next dimension
• No context-switch to browser or CLI for a simple numeric change

References

• bk job reprioritize in buildkite/cli
• Buildkite REST API: PUT /v2/organizations/{org}/pipelines/{pipe}/builds/{build}/jobs/{job}

Acceptance

• p key on a highlighted step triggers reprioritization prompt
• Inline status bar prompt accepts numeric input
• Validates range (e.g. 0-1000), shows error for invalid input
• On success, step badge updates to show new priority if visible
• On failure, error shown in status bar
• Only available for script-type steps (not waiters or triggers)