refactor: split monolithic handlers + testing into domain-grouped modules

handlers/api.rs (1706 LOC) + html.rs (1735 LOC) → 12 domain files:
auth, diary, movies, users, search, watchlist, goals, social,
integrations, helpers + existing import/webhook/wrapup/images/rss.

domain/testing.rs (1309 LOC) → testing/ module:
in_memory, fakes, noops, panics, wrapup.

Update README + architecture.mmd with goals feature.

crates/presentation/src/handlers/integrations.rs

@@ -0,0 +1,210 @@
+use axum::{
+    Form,
+    extract::{Extension, Path, Query, State},
+    http::StatusCode,
+    response::{IntoResponse, Redirect},
+};
+use uuid::Uuid;
+
+use application::integrations::{
+    commands::{
+        ConfirmWatchEventsCommand, DismissWatchEventsCommand, GenerateWebhookTokenCommand,
+        RevokeWebhookTokenCommand, WatchEventConfirmation,
+    },
+    confirm as confirm_watch_events, dismiss as dismiss_watch_events,
+    generate_token as generate_webhook_token, get_queue as get_watch_queue,
+    get_tokens as get_webhook_tokens,
+    queries::{GetWatchQueueQuery, GetWebhookTokensQuery},
+    revoke_token as revoke_webhook_token,
+};
+
+use crate::{
+    csrf::CsrfToken, extractors::RequiredCookieUser, forms::ErrorQuery, render::render_page,
+    state::AppState,
+};
+use template_askama::{IntegrationsTemplate, WatchQueueTemplate};
+
+use super::helpers::build_page_context;
+
+fn encode_error(msg: &str) -> String {
+    use percent_encoding::{NON_ALPHANUMERIC, utf8_percent_encode};
+    utf8_percent_encode(msg, NON_ALPHANUMERIC).to_string()
+}
+
+// ── HTML ─────────────────────────────────────────────────────────────────────
+
+pub async fn get_integrations_page(
+    RequiredCookieUser(user_id): RequiredCookieUser,
+    State(state): State<AppState>,
+    Query(params): Query<crate::forms::IntegrationsQuery>,
+    Extension(csrf): Extension<CsrfToken>,
+) -> impl IntoResponse {
+    let mut ctx = build_page_context(&state, Some(user_id.clone()), csrf.0).await;
+    ctx.page_title = "Integrations — Movies Diary".to_string();
+    ctx.canonical_url = format!("{}/settings/integrations", state.app_ctx.config.base_url);
+
+    let query = GetWebhookTokensQuery {
+        user_id: user_id.value(),
+    };
+    let tokens = get_webhook_tokens::execute(&state.app_ctx, query)
+        .await
+        .unwrap_or_default();
+
+    let token_views: Vec<template_askama::WebhookTokenView> = tokens
+        .iter()
+        .map(crate::mappers::integrations::webhook_token_view)
+        .collect();
+
+    let webhook_base_url = state.app_ctx.config.base_url.clone();
+    render_page(IntegrationsTemplate {
+        ctx: &ctx,
+        tokens: &token_views,
+        webhook_base_url: &webhook_base_url,
+        new_token: params.token.as_deref(),
+    })
+    .into_response()
+}
+
+pub async fn post_generate_token(
+    RequiredCookieUser(user_id): RequiredCookieUser,
+    State(state): State<AppState>,
+    Extension(csrf): Extension<CsrfToken>,
+    Form(form): Form<crate::forms::GenerateTokenForm>,
+) -> impl IntoResponse {
+    if crate::csrf::mismatch(&csrf, &form.csrf_token) {
+        return StatusCode::FORBIDDEN.into_response();
+    }
+
+    let provider = match form.provider.parse::<domain::models::WatchEventSource>() {
+        Ok(p) => p,
+        Err(_) => return Redirect::to("/settings/integrations").into_response(),
+    };
+
+    let cmd = GenerateWebhookTokenCommand {
+        user_id: user_id.value(),
+        provider,
+        label: form.label.filter(|l| !l.trim().is_empty()),
+    };
+
+    match generate_webhook_token::execute(&state.app_ctx, cmd).await {
+        Ok(result) => {
+            let encoded = percent_encoding::utf8_percent_encode(
+                &result.token_plaintext,
+                percent_encoding::NON_ALPHANUMERIC,
+            );
+            Redirect::to(&format!("/settings/integrations?token={encoded}")).into_response()
+        }
+        Err(e) => {
+            tracing::error!("generate token failed: {:?}", e);
+            Redirect::to("/settings/integrations").into_response()
+        }
+    }
+}
+
+pub async fn post_revoke_token(
+    RequiredCookieUser(user_id): RequiredCookieUser,
+    State(state): State<AppState>,
+    Path(token_id): Path<Uuid>,
+    Extension(csrf): Extension<CsrfToken>,
+    Form(form): Form<crate::forms::RevokeTokenForm>,
+) -> impl IntoResponse {
+    if crate::csrf::mismatch(&csrf, &form.csrf_token) {
+        return StatusCode::FORBIDDEN.into_response();
+    }
+
+    let cmd = RevokeWebhookTokenCommand {
+        user_id: user_id.value(),
+        token_id,
+    };
+    if let Err(e) = revoke_webhook_token::execute(&state.app_ctx, cmd).await {
+        tracing::error!("revoke token failed: {:?}", e);
+    }
+
+    Redirect::to("/settings/integrations").into_response()
+}
+
+// ── Watch Queue ──────────────────────────────────────────────────────────────
+
+pub async fn get_watch_queue_page(
+    RequiredCookieUser(user_id): RequiredCookieUser,
+    State(state): State<AppState>,
+    Query(params): Query<ErrorQuery>,
+    Extension(csrf): Extension<CsrfToken>,
+) -> impl IntoResponse {
+    let mut ctx = build_page_context(&state, Some(user_id.clone()), csrf.0).await;
+    ctx.page_title = "Watch Queue — Movies Diary".to_string();
+    ctx.canonical_url = format!("{}/watch-queue", state.app_ctx.config.base_url);
+
+    let query = GetWatchQueueQuery {
+        user_id: user_id.value(),
+    };
+    let events = get_watch_queue::execute(&state.app_ctx, query)
+        .await
+        .unwrap_or_default();
+
+    let entries: Vec<template_askama::WatchQueueDisplayEntry> = events
+        .iter()
+        .map(crate::mappers::integrations::watch_queue_entry)
+        .collect();
+
+    render_page(WatchQueueTemplate {
+        ctx: &ctx,
+        entries: &entries,
+        error: params.error.as_deref(),
+    })
+    .into_response()
+}
+
+pub async fn post_confirm_single(
+    RequiredCookieUser(user_id): RequiredCookieUser,
+    State(state): State<AppState>,
+    Path(event_id): Path<Uuid>,
+    Extension(csrf): Extension<CsrfToken>,
+    Form(form): Form<crate::forms::ConfirmWatchForm>,
+) -> impl IntoResponse {
+    if crate::csrf::mismatch(&csrf, &form.csrf_token) {
+        return StatusCode::FORBIDDEN.into_response();
+    }
+
+    let cmd = ConfirmWatchEventsCommand {
+        user_id: user_id.value(),
+        confirmations: vec![WatchEventConfirmation {
+            watch_event_id: event_id,
+            rating: form.rating,
+            comment: form.comment.filter(|c| !c.trim().is_empty()),
+        }],
+    };
+
+    match confirm_watch_events::execute(&state.app_ctx, cmd).await {
+        Ok(_) => Redirect::to("/watch-queue").into_response(),
+        Err(e) => {
+            let msg = encode_error(&e.to_string());
+            Redirect::to(&format!("/watch-queue?error={msg}")).into_response()
+        }
+    }
+}
+
+pub async fn post_dismiss_single(
+    RequiredCookieUser(user_id): RequiredCookieUser,
+    State(state): State<AppState>,
+    Path(event_id): Path<Uuid>,
+    Extension(csrf): Extension<CsrfToken>,
+    Form(form): Form<crate::forms::DismissWatchForm>,
+) -> impl IntoResponse {
+    if crate::csrf::mismatch(&csrf, &form.csrf_token) {
+        return StatusCode::FORBIDDEN.into_response();
+    }
+
+    let cmd = DismissWatchEventsCommand {
+        user_id: user_id.value(),
+        event_ids: vec![event_id],
+    };
+
+    match dismiss_watch_events::execute(&state.app_ctx, cmd).await {
+        Ok(_) => Redirect::to("/watch-queue").into_response(),
+        Err(e) => {
+            let msg = encode_error(&e.to_string());
+            Redirect::to(&format!("/watch-queue?error={msg}")).into_response()
+        }
+    }
+}