Show accepted word count badge in menu bar icon

[FuJacob]

Summary

Surfaces the total accepted word count as a compact number to the right of the paw icon in the menu bar. The badge is hidden when the count is zero, so new users see a clean icon until they start accepting suggestions.

Validation

xcodebuild -project tabby.xcodeproj -scheme tabby -destination 'platform=macOS' test CODE_SIGNING_ALLOWED=NO
# Executed 253 tests, with 0 failures (0 unexpected)

swiftlint lint --quiet
# exit 0 (no new warnings)

Screenshot not included — requires manual testing to verify menu bar rendering since the label only updates after accepting a suggestion in a live text field.

Linked issues

N/A — new feature request.

Risk / rollout notes

• tabby.xcodeproj/project.pbxproj updated to register WordCountFormatterTests.swift in the test target.
• MenuBarStatusLabelView now takes SuggestionCoordinator as an @ObservedObject parameter. The coordinator was already public on AppDelegate.
• WordCountFormatter is a pure helper in Support/ with 9 test cases covering all formatting tiers (raw, K, M).

Greptile Summary

This PR surfaces the total accepted word count as a compact badge to the right of the paw icon in the menu bar, hidden when the count is zero so new users see a clean icon until they start accepting suggestions.

• WordCountFormatter is a new pure Support/ helper that maps integer word counts to compact strings (\"999\", \"1.5K\", \"10K\", \"1.0M\") with 9 unit tests covering all tiers, including the %.1f rounding boundary at 9,999.
• MenuBarStatusLabelView is updated to accept SuggestionCoordinator as an @ObservedObject and conditionally render the formatted label next to the icon; the coordinator was already a public property on AppDelegate, so the wiring in CotabbyApp.swift is a one-line change.
• project.pbxproj registers WordCountFormatterTests.swift in the test target's file-reference and build-sources sections following the existing GUID naming convention.

Confidence Score: 5/5

Safe to merge; the change adds a read-only display layer on top of an already-maintained counter without touching any acceptance, insertion, or state-machine logic.

The new WordCountFormatter is pure and thoroughly tested. The coordinator wiring is a one-line pass-through of an already-public object. The word-count property is @published on @mainactor so SwiftUI observation is safe. No data flow, persistence, or acceptance logic is altered by this PR.

No files require special attention.

Important Files Changed

Filename	Overview
Cotabby/Support/WordCountFormatter.swift	New pure helper; correctly segments raw, K, and M tiers with integer division for the coarser bands and %.1f for the fine-grained ones. No logic issues.
Cotabby/UI/MenuBarStatusLabelView.swift	Adds a word-count badge next to the paw icon by observing the full SuggestionCoordinator; badge logic is correct but the view re-renders on every coordinator @published mutation, not just totalTabAcceptedWordCount changes.
Cotabby/App/Core/CotabbyApp.swift	Minimal change: passes the existing long-lived coordinator instance into the label view; no ownership or lifecycle issues.
CotabbyTests/WordCountFormatterTests.swift	Nine focused test cases covering nil, negative, raw, K one-decimal, K whole, M one-decimal, and M whole tiers; boundary rounding case (9,999 → "10.0K") is explicitly verified.
Cotabby.xcodeproj/project.pbxproj	Registers WordCountFormatterTests.swift in both the file reference and test-target build sources sections; GUIDs follow the existing naming convention.

Sequence Diagram

sequenceDiagram
    participant User
    participant SuggestionCoordinator
    participant MenuBarStatusLabelView
    participant WordCountFormatter

    User->>SuggestionCoordinator: Tab accepted (acceptSuggestion)
    SuggestionCoordinator->>SuggestionCoordinator: recordAcceptedWords(from: chunk)
    SuggestionCoordinator->>SuggestionCoordinator: "totalTabAcceptedWordCount += n"
    SuggestionCoordinator->>SuggestionCoordinator: userDefaults.set(count)
    SuggestionCoordinator-->>MenuBarStatusLabelView: "objectWillChange fires (@Published)"
    MenuBarStatusLabelView->>WordCountFormatter: compactLabel(for: totalTabAcceptedWordCount)
    WordCountFormatter-->>MenuBarStatusLabelView: "42" / "1.5K" / nil
    MenuBarStatusLabelView-->>User: Menu bar badge updated (or hidden if nil)

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_{Reviews (3): Last reviewed commit: "Fix docstring: document rounding at 9,95..." | Re-trigger Greptile}