Add progress bars and spinners for long-running CLI operations

[Copilot]

Any operation taking >30s (container startup, Azure Bicep deployment, DB migration, pipeline sync) gave no visual feedback beyond a static message. Users had no way to gauge progress or distinguish a slow operation from a hang.

New: cmd/progress.go

Zero-dependency terminal progress UI with three primitives:

• progressBar — in-place [████████░░░░░░░░] 8/36 waiting for DevLake (1m20s elapsed) via \r
• countdown(n, label) — deterministic per-second fill bar for fixed-duration sleeps
• spinWhile(label, fn) — runs fn in a goroutine, shows a braille spinner (⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏) until it returns

Constants progressLineWidth = 72 and progressBarWidth = 24 keep rendering consistent across all callers.

Applied to long-running operations

Location	Before	After
waitForReady / waitForReadyAny / waitForMigration	New line per poll attempt	Single in-place progress bar
startLocalContainers — MySQL init sleep	time.Sleep(30s)	countdown(30, "MySQL initializing")
DeployBicep in deploy_azure.go	Blocking call, no feedback	spinWhile("Deploying Azure resources via Bicep", ...)
Azure MySQL restart sleep	time.Sleep(30s)	countdown(30, "waiting for MySQL")
triggerAndPoll in configure_projects.go	New line every 10s with raw elapsed/status	In-place [████░░░░] 3/8 tasks — TASK_RUNNING (45s elapsed)

Example — spinner wrapping Bicep deployment

var deployment *azure.DeploymentOutput
err = spinWhile("Deploying Azure resources via Bicep (this takes several minutes)", func() error {
    var innerErr error
    deployment, innerErr = azure.DeployBicep(azureRG, templatePath, params)
    return innerErr
})

On failure, spinWhile clears the spinner line before returning so the caller's error message lands on a clean line.

Original prompt

Add "progress bar" capability in the UI to Containers spinning up and long deployment ones like Azure deployment. Basically anything in the flow where a user has to wait longer than 30 seconds for something should ideally have a progress bar

The user has attached the following file paths as relevant context:

• .github/copilot-instructions.md
• AGENTS.md
• AGENTS.md

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