kvitt/docs/ux/ia.md

Kvitt: information architecture

Status: U1 (2026-10-17), updated in U2 (2026-10-18) for the owner's decisions (proposed-decisions.md: three tabs kept, UX-2; category suggestion, UX-3; 14 default categories, UX-8). Look and states of each screen: design-spec.md. Binding inputs: SPEC §13.2 (navigation model), §13.3 (screens S-1 to S-22), §14.2.4 (UI contract), §6.2 (module ownership). Screen ids are the spec's (S-1 … S-22), not renumbered.

1. Bottom navigation

Decided (owner, 2026-10-18, UX-2): the spec's three destinations.

Destination	sv	en	Icon (Material Symbols)	Start screen
Home	Översikt	Home	home (filled when selected)	S-4
Analytics	Statistik	Analytics	bar_chart	S-11
Settings	Inställningar	Settings	settings	S-13

Plus one floating action button, "Lägg till utgift" / "Add expense", on S-4 and S-5 only (SPEC §13.2).

Why three and not four:

1. Home already is the account list. The second most important question ("who owes whom", §13.1) is answered per account on Home (AC-10.2). A separate "Accounts" destination would split the global balance from its breakdown and add a tap to the most common path (Home → account → expense).
2. The add flow is the FAB, not a tab. A tab "Add" would be a navigation item that is really an action; Material 3 discourages that, and the FAB is reachable with the thumb on both phones.
3. No fourth destination exists in the spec. The only candidate that would earn the slot is an Activity feed (the other person's latest changes across all accounts, i.e. the audit log as a list). It would be useful together with push notifications (US-13), but it is a new feature, out of scope for the UX sprint (§13.5). The owner did not take it for v1 (UX-2).
4. Three items keep Swedish labels whole: "Inställningar" (13 characters) fits at 200 % font scale in a three-item bar but not in a four- or five-item bar of 411 dp.

Navigation bar style: Expressive ShortNavigationBar (64 dp; fallback NavigationBar), design-spec.md §3.11.

2. Screen inventory

Kind: top = bottom-nav destination; pushed = full screen with top app bar and back (§13.2); flow = onboarding screen without bottom nav; dialog / banner as named.

Id	Screen (sv / en)	Kind	Feature module (§6.2)	Reached from	State from (§14.2.4)
S-1	Para ihop / Pair	flow, start when Unpaired or Unrecognised	:feature:onboarding	app start; deep link kvitt://invite?… or https://…/i/<CODE> (AC-2.6); S-18	SessionRepository
S-2	Din profil (partner step) / Your profile	flow	:feature:onboarding	S-1 after a partner pairing (AC-2.10)	SessionRepository, ProfileRepository
S-3	Väntar på din partner / Waiting for your partner	top (replaces S-4 content)	:feature:onboarding	Home while partner == null (AC-5.1)	SessionRepository, InviteRepository
S-4	Översikt / Home	top	:feature:home	bottom nav; notification for deletions and sync_batch	HomeRepository → HomeState
S-5	Konto (account detail)	pushed	:feature:account	S-4 account row	AccountRepository.detail → AccountDetailState
S-6	Nytt konto / Ändra konto	pushed	:feature:account	S-4 "Nytt konto"; S-5 overflow "Ändra konto"	AccountRepository
S-7	Ny utgift / Ändra utgift	pushed, full screen (§13.2)	:feature:expense	FAB on S-4 or S-5; S-8 "Ändra"; S-19 editor reuses its fields	ExpenseRepository.editorOptions, preview, save, suggestCategory (UX-3)
S-8	Utgift (expense detail)	pushed	:feature:expense	ledger rows (S-5, S-12, S-16); notification	ExpenseRepository.detail → ExpenseDetailState
S-9	Gör upp / Settle up	pushed	:feature:settle	S-4 "Gör upp" (global); S-5 "Gör upp det här kontot" (per account); S-10 "Ändra"	SettlementRepository.start, recompute, save → SettleState
S-10	Betalning (settlement detail)	pushed	:feature:settle	settlement rows; notification	SettlementRepository.detail
S-11	Statistik / Analytics	top	:feature:analytics	bottom nav	AnalyticsRepository.analytics → AnalyticsState
S-12	Statistik, urval (drill-down)	pushed	:feature:analytics	tap on a bar or a breakdown row in S-11 (AC-14.8)	AnalyticsRepository.drillDown
S-13	Inställningar / Settings	top	:feature:settings	bottom nav	ProfileRepository.household, SessionRepository (role)
S-14	Profil	pushed	:feature:settings	S-13	ProfileRepository
S-15	Kategorier (list + editor; 14 default categories, UX-8)	pushed (editor pushed from list)	:feature:settings	S-13	CategoryRepository
S-16	Synkstatus / Sync status	pushed	:feature:home	S-4 sync line; S-13 "Synkstatus"	SyncRepository.status
S-17	Uppdatering (banner + dialogs)	banner on S-4, dialogs	:feature:home	S-4 when UpdateState != None; S-22 "Sök efter uppdatering"	UpdateRepository
S-18	Telefonen har tagits bort / Device removed	flow, start when Revoked	:feature:onboarding	any 401 device_revoked (AC-3.3)	SessionRepository.acknowledgeRevoked
S-19	Återkommande utgifter (list + editor)	pushed	:feature:settings	S-13	RecurringRepository
S-20	Enheter / Devices	pushed	:feature:settings	S-13	DeviceRepository
S-21	Inbjudningar (Bjud in partner / Para ihop en enhet)	pushed	:feature:settings	S-13 (admin only); S-3 "Bjud in partner"	InviteRepository
S-22	Om Kvitt / About	pushed	:feature:settings	S-13	AboutRepository, UpdateRepository.check

System notifications (SPEC §13.3 table, §14.6) are not screens; they open S-8, S-10 or S-4 (AC-13.6).

3. Start destination and session routing

The app shell (:app) chooses the root from SessionRepository.session:

SessionState	Root	Notes
Unpaired	S-1	Fields filled when opened from an invite link.
Paired, partner == null	S-4 showing the S-3 content	Bottom nav visible; Statistik shows its empty state; FAB hidden (AC-5.1). For the member this state cannot occur.
Paired, just paired as partner	S-2, then S-4	AC-2.10. Notification permission is asked after the first full sync (AC-2.9), i.e. on arriving at S-4.
Paired	S-4	First sync after pairing shows the S-4 loading state.
Revoked	S-18	Local data already wiped (AC-3.3).
Unrecognised	S-1 with "Para ihop telefonen igen" header	Local data kept (§14.4.8).

Back from a top destination exits the app (Home) or returns to Home (Statistik, Inställningar). Each top destination keeps its own back stack and scroll position when switching tabs.

4. Navigation map

            ┌──────────────── bottom nav ─────────────────┐
            S-4 Översikt            S-11 Statistik        S-13 Inställningar
            │  ├ sync line → S-16      └ bar/row → S-12      ├ S-14 Profil
            │  ├ banner → S-17            └ row → S-8         ├ S-15 Kategorier → editor
            │  ├ Gör upp → S-9 (global)                       ├ S-19 Återkommande → editor (S-7 fields)
            │  ├ Nytt konto → S-6                             ├ S-20 Enheter
            │  ├ FAB → S-7                                    ├ S-21 Inbjudningar (admin)
            │  └ account → S-5                                ├ S-16 Synkstatus
            │        ├ FAB → S-7                              └ S-22 Om Kvitt → S-17
            │        ├ Gör upp det här kontot → S-9 (one account)
            │        ├ overflow: Ändra konto → S-6, Arkivera, Ta bort
            │        ├ expense row → S-8 → Ändra → S-7
            │        └ settlement row → S-10 → Ändra → S-9
 Onboarding: S-1 → (partner) S-2 → S-4 ;  S-1 → (admin) S-4 with S-3 content → S-21
 Anywhere: 401 device_revoked → S-18 → S-1

After saving in S-7 the app returns to where the editor was opened from (S-4 or S-5, or S-8 when editing). After confirming S-9 it returns to S-4 or S-5.

5. Which screen owns which data

"Owns" = the only place where the data is created or edited. Every other screen only reads it. Offline column per AC-15.2 and §9.9.

Data	Owned (edited) by	Read by	Offline edit
Session, pairing, device token	S-1, S-18	:app routing	no (pairing needs the server)
Own display name and picture	S-14 (and S-2 once for the partner)	S-4 hero, S-13, all avatars, timelines	no ("Kräver anslutning")
Partner's name and picture	partner's own S-14	everywhere	—
Accounts (name, default ratio, archived, deleted)	S-6 (create, edit), S-5 overflow (archive, unarchive, delete)	S-4, S-7 picker (active only), S-9 rows and "Lägg till konto" (all), S-11/S-12, S-19 picker	no
Categories	S-15	S-7 quick row and "Alla" sheet (active only; selected by the suggestion of UX-3 for new expenses), S-8, ledger rows, S-11/S-12, S-19	no
Recurring templates	S-19	S-8 ("Återkommande: Hyra")	no
Expenses	S-7 (create, edit), S-8 (delete)	S-4 (counts, balances), S-5, S-11/S-12, S-16 (pending)	yes
Settlements	S-9 (create, edit), S-10 (delete)	S-4/S-5 balances and rows, S-16 (pending)	yes
Audit timeline	server only (never edited)	S-8, S-10	—
Balances, proposals, analytics	computed, never stored (§5.5)	S-4, S-5, S-9, S-11, S-12	always available
Devices	S-20 (revoke)	—	no
Invites	S-21 (create, share, cancel), S-3 shortcut	S-3 (expiry of the pending invite)	no
Sync state, rejections	system; S-16 dismisses rejections	S-4 sync line	dismiss works offline
App update	S-17	S-4 banner, S-22	no

6. Role differences (admin vs member)

Where	Admin (Jacob)	Member (Anna)
S-13	row "Bjud in partner" (before the partner joins) or "Para ihop en enhet"	row "Para ihop en enhet" is not shown (AC-2.2: only the admin creates invites).
S-20	all devices of both users; revoke any except the current	own devices only; revoke own except the current (AC-3.2)
S-21	available	not reachable
S-3	shown until the partner joins	never

Everything else is identical for both users (§3.1).