fix(activity): use actual bucket IDs in multidevice query (fixes BucketNotFound with aw-sync data)

[Q-Ze]

Fix BucketNotFound in multidevice query when viewing aw-sync data

Problem

With aw-sync set up between machines, enabling the "Use multidevice query" developer setting and opening the Activity view fails on every machine except the one being viewed:

BucketNotFound("Failed to find bucket 'aw-watcher-window_<hostname>'")

Root cause

Buckets pulled in by aw-sync keep their original hostname field, but their bucket ID gets an -synced-from-<host> suffix (e.g. aw-watcher-window_myhost-synced-from-myhost).

• bucketsByHostname groups by the hostname field, so synced hosts correctly appear in the device list;
• but multideviceQuery reconstructs bucket IDs from the hostname (get_params: bid_window: 'aw-watcher-window_' + host) and query_multidevice_full passes host_params: {}, so the existing per-host override mechanism in get_params is never used;
• query_bucket("aw-watcher-window_myhost") then fails with BucketNotFound, since only the suffixed ID exists in the local datastore.

Fix

1. Fill host_params with each host's actual bucket IDs (first window/afk bucket from the buckets store), so synced buckets are queried by their real IDs.
2. Only include hosts that have both a window and an afk bucket (the pair canonicalEvents requires), matching the single-device path — previously only the window bucket was required, which could produce the same error for the afk bucket.

Verification

With two machines synced via aw-sync (one viewing the other's data):

• Before: the query the UI generates returns HTTP 400 BucketNotFound("Failed to find bucket 'aw-watcher-window_QBZdeMac-mini.local'").
• After: the same multidevice query (two hosts, union_no_overlap) executes successfully, e.g. {"duration": 22392.738} for the day across both hosts.

[greptile-apps]

Greptile Summary

This PR fixes multidevice activity queries for synchronized data by passing each host's actual window and AFK bucket IDs instead of reconstructing IDs from hostnames.

• Restricts multidevice queries to hosts with the required window/AFK pair.
• Builds host-specific query overrides from the loaded bucket inventory.
• Leaves the new regression path untested and bypasses its declared parameter type with any.

Confidence Score: 4/5

The PR appears safe to merge, with only non-blocking test-coverage and type-safety improvements recommended.

The new host-specific bucket overrides match the query builder's runtime contract and resolve the synced-ID failure, while the remaining findings concern regression protection and maintainability rather than incorrect runtime behavior.

Files Needing Attention: src/stores/activity.ts

Important Files Changed

Filename	Overview
src/stores/activity.ts	Filters hosts by required bucket pairs and supplies actual bucket IDs to multidevice queries; behavior appears correct, with test-coverage and typing improvements recommended.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Inventory[Bucket inventory] --> Filter{Host has window and AFK buckets?}
  Filter -- No --> Skip[Exclude host]
  Filter -- Yes --> IDs[Select actual bucket IDs]
  IDs --> Params[Build host_params by hostname]
  Params --> Query[Generate multidevice query]
  Query --> Server[Query ActivityWatch]
  Server --> Merge[Merge per-host activity]

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_{Reviews (1): Last reviewed commit: "fix(activity): use actual bucket IDs in ..." | Re-trigger Greptile}

[greptile-apps]

Missing multidevice regression tests

The new synced-bucket override path has no focused test covering suffixed bucket IDs or the exclusion of hosts missing an AFK bucket. Because this behavior is enforced during query generation rather than by the type system, a later change could silently restore the original BucketNotFound failure. Please add a multidevice query test that verifies the actual window and AFK bucket IDs are emitted and incomplete hosts are omitted.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

[greptile-apps]

Host parameters bypass typing

Casting host_params to any suppresses the query builder's declared parameter contract. This means a future incompatible change to either side would not produce a type error. Please model this value using the partial desktop-parameter shape that get_params actually accepts instead of bypassing type checking.

[Q-Ze]

Thanks for the review! Both non-blocking findings are addressed in d5ab9e7:

• Test coverage: the host-selection logic now lives in a pure helper (buildMultideviceHostParams, src/util/multidevice.ts) with unit tests, plus a regression test asserting the generated query references the actual (suffixed) bucket IDs and not the reconstructed aw-watcher-window_<host> ones.
• Type safety: the as any cast is gone — host_params values are now typed as Partial<DesktopQueryParams> | Partial<AndroidQueryParams>, which matches the override semantics in get_params (only keys present and non-empty are applied).