fix(categories): import JSON from Android SAF and persist a single save

[TimeToBuildBob]

Problem

v0.14.0b2 user report (ActivityWatch/aw-android#247):

• In-app category import gives no feedback after picking a file.
• Browser-mode import appears to succeed, then save "breaks down" and the app still shows default categories.

Two independent bugs:

1. MIME-only reject. importCategories required file.type == 'application/json'. Android SAF/WebView often reports .json as application/octet-stream, empty, or text/plain, so import silently console.error'd and returned.
2. Save race + unsynced import. import() wrote this.classes but not category_sets. save() then fired saveCategories() and saveClasses() as two un-awaited settingsStore.update() calls. Those two saves raced: one could persist an empty/default snapshot, reload it, and the other would write defaults back. jsonEq could also throw on an unserializable key and abort the whole save with no UI error.

Fix

• Accept JSON by MIME, .json name, or Android-ambiguous types; reject camera/gallery images with a visible alert. Parse errors are visible instead of silent.
• File input now has accept=".json,application/json" so the Android picker from refactor: refactored event viewer (in Query/Search views) into component, changed use of (broken) aw-timeline to vis-timeline #248 prefers JSON.
• import() creates a primary set if needed, runs createMissingParents, and syncs into that set before save.
• save() is async, awaits a single saveCategories() (which already writes the legacy classes field), and only clears the unsaved flag after success.
• Settings jsonEq no longer throws the whole save if one key cannot be serialized.
• Save failures surface an alert instead of a white screen.

Testing

npx jest --selectProjects node --testPathPattern 'importFile|store/categories' --coverage=false

21 passed (including new import-file MIME cases and import→primary-set sync).

Does not close ActivityWatch/aw-android#247 on its own: the Android app still needs an aw-webui submodule bump after this merges.

[greptile-apps]

Greptile Summary

The PR makes category imports compatible with Android SAF file metadata and consolidates category persistence into one awaited settings update.

• Accepts JSON imports using MIME type, filename, or Android-ambiguous file types and surfaces parse or save errors to users.
• Synchronizes imported categories into the primary category set before persistence.
• Removes the competing legacy save call and clears the unsaved state only after successful persistence.
• Prevents serialization comparison failures from aborting an entire settings save.
• Adds focused tests for import file handling and primary-set synchronization.

Confidence Score: 5/5

The PR appears safe to merge with no concrete changed-code defects identified.

The import flow now synchronizes category data before issuing a single awaited settings update, while rejected file parsing and explicit save failures receive visible handling.

Important Files Changed

Filename	Overview
src/stores/categories.ts	Synchronizes imports into category sets and converts saving to one awaited persistence operation.
src/stores/settings.ts	Makes JSON equality comparison fail safely when a setting cannot be serialized.
src/util/classes.ts	Returns the category settings update promise so callers can await persistence.
src/util/importFile.ts	Adds Android-compatible file eligibility checks and top-level category export parsing.
src/views/settings/CategorizationSettings.vue	Integrates the import helpers, resets file selection, and displays import and explicit-save failures.
test/unit/importFile.test.node.ts	Covers Android MIME variations and recognized category export envelopes.
test/unit/store/categories.test.node.ts	Verifies that a legacy import initializes and synchronizes a primary category set.

Sequence Diagram

sequenceDiagram
    participant User
    participant UI as Categorization settings
    participant Categories as Category store
    participant Settings as Settings store
    participant Service as ActivityWatch service
    User->>UI: Select category JSON
    UI->>UI: Check file type and parse export
    UI->>Categories: Import categories
    Categories->>Categories: Add missing parents and sync primary set
    User->>UI: Save
    UI->>Categories: await save()
    Categories->>Settings: update category sets, active IDs, legacy classes
    Settings->>Service: Persist one settings snapshot
    Service-->>Settings: Save result
    Settings-->>Categories: Resolve
    Categories->>Categories: Clear unsaved flag

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_{Reviews (1): Last reviewed commit: "fix(categories): import JSON from Androi..." | Re-trigger Greptile}

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.75%. Comparing base (3eebf68) to head (850cdff).

Files with missing lines	Patch %	Lines
src/stores/settings.ts	0.00%	6 Missing ⚠️
src/stores/categories.ts	90.90%	1 Missing ⚠️
src/util/classes.ts	0.00%	1 Missing ⚠️
src/util/importFile.ts	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #956      +/-   ##
==========================================
+ Coverage   49.62%   49.75%   +0.12%     
==========================================
  Files          46       47       +1     
  Lines        2783     2810      +27     
  Branches      630      608      -22     
==========================================
+ Hits         1381     1398      +17     
- Misses       1322     1391      +69     
+ Partials       80       21      -59     

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[TimeToBuildBob]

CI red was not the category import: unit tests 35/35 and e2e 7/7 passed. Test (node-20, py-3.9, aw-server-rust master) died in the post-test log glob after ActivityWatch/aw-server-rust#652 moved --testing logs on a fresh runner to ~/.cache/activitywatch-testing/log/.

Pushed 850cdff to collect ~/.cache/activitywatch*/log/*/*.log with nullglob, so tagged releases and named profiles both work and missing logs no longer fail the job.

[TimeToBuildBob]

CI-green and mergeable (Greptile 5/5) — waiting only on a maintainer click.

This PR is ready to merge, but the bot has pull-only access to this repo and can't self-merge — surfacing it here so it isn't lost. The monitoring loop will stop re-flagging it now that this note is posted.