[#104] UI → Improve status icon

[revett]

Resolves #104

Problem

• During a large first sync the status bar shows a spinner with no counts, which reads as hung after the first minute
• At rest it says "click to sync", so nothing distinguishes "synced ten seconds ago" from "has not synced since Tuesday"
• Automatic sync made both of these required rather than cosmetic: the click used to be the feedback, and there is no click now

Changes

• Added status, a pure module holding the single table that decides what the bar says in each state, so every word is pinned by one test
• Gave the status bar a label beside the icon, since a tooltip only answers a question you already thought to ask

State	Says
Nothing synced yet	Not synced yet
Resting	Synced 2m ago
A pass with no plan	Checking...
A pass applying one	Syncing 12/340
A pass failed	Sync failed
Automatic sync off	Sync paused

• Taught a pass to report progress, once before the first action and once per action after it, failures included
• Remembered the time of the last completed pass per device in vault scoped localStorage, beside the pause flag and the device ID
• Forgot that time when settings repoint the vault at a bucket it has never synced, since the old one is then about somewhere else

Why

• Silence means everything is fine, which is only a promise worth making if the bar can say when it was last true
• Checking... is not a placeholder: a first sync spends most of its time reading the manifest and hashing the vault, before there is any plan to count, and that is exactly the stretch the spinner was worst at
• Progress counts attempted actions rather than successful ones, because a number that stops moving on the first bad file reads as the hang it is there to disprove
• Ages are coarse on purpose, minutes then hours then days; nothing finer would be read, and nothing coarser answers the question
• A pass that applied nothing still counts as synced, since it proves the vault and the bucket agree

Greptile Summary

The PR adds a labeled status-bar state model, per-action sync progress, and persisted last-success timestamps.

• Introduces pure status wording and transition helpers with focused unit coverage.
• Reports execution progress from the sync engine to the status bar.
• Preserves or clears per-device sync history according to the configured target and state-read result.
• Updates the technical documentation and status-bar styling.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/main.ts	Wires status rendering, last-sync persistence, progress callbacks, and tri-state state reads into the plugin lifecycle.
src/status/status.ts	Adds pure status transitions, elapsed-time labels, icon selection, and tooltip generation.
src/status/status.test.ts	Covers status views, elapsed-time boundaries, transitions, and persisted timestamp validation.
src/sync/execute.ts	Reports progress before execution and after each attempted action.
src/sync/sync.ts	Threads an optional progress callback through sync orchestration.
styles.css	Styles the labeled status item and preserves icon animation and state-specific appearance.

_{Reviews (2): Last reviewed commit: "Address comments" | Re-trigger Greptile}

Context used (3)

• Context used - AGENTS.md (source)
• Knowledge Base — Plugin entrypoint (src/main.ts)
• Knowledge Base — Sync flow