fast, readable log: stop routine noise, keyset paging, token search

The log had 6.45M rows, of which 434 were actual actions: every mail x
every non-matching rule wrote "Keine Übereinstimmung" (5.3M rows, ~1 GB),
plus "keine neuen Mails" per rule every 30s and a "Poll gestartet" row.
Free-text searches took 50-70s.

- Routine entries are only written with LOG_VERBOSE=true; the poll
  summary is logged only when there were new mails, actions or errors.
  "Why didn't my rule match" is now answered by the rule tester.
- The scheduler commits every 25 evaluated mails and after each rule,
  since the dropped log calls used to be the implicit commit points.
- Migration rebuilds filter_logs without the routine rows (live:
  6.45M -> ~38k) via copy instead of DELETE.
- /api/logs: keyset pagination (before_id) instead of OFFSET, count
  capped at 1000, since/until range, multi-level filter, per-field
  filters; ordner: also matches the move target stored in details.
- New log page: one search field with shortcuts (von:, betreff:,
  regel:, ordner:, text:), live search with debounce and abort, active
  filters as removable chips, click on rule/sender/folder in a row to
  filter, time range (default 7 days), level quick filter, expandable
  row details, "Ältere laden", filters kept in the URL.
- Disable Pico's colour transition on segmented buttons (they briefly
  flashed in the primary colour on load).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

alembic/versions/9a3f5c1d7e42_purge_routine_logs.py

@@ -0,0 +1,62 @@
+"""purge routine entries from filter_logs
+
+Revision ID: 9a3f5c1d7e42
+Revises: 7d1e4a2b9c30
+Create Date: 2026-09-29 00:00:00.000000
+
+"""
+import re
+from typing import Sequence, Union
+
+from alembic import op
+from sqlalchemy import text
+
+
+revision: str = "9a3f5c1d7e42"
+down_revision: Union[str, Sequence[str], None] = "7d1e4a2b9c30"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+# Routine-Einträge, die ab jetzt nur noch mit LOG_VERBOSE geschrieben werden.
+# Sie machten >99% der Tabelle aus (Millionen Zeilen) und machten Suchen langsam.
+NOISE = """
+    message = 'Keine Übereinstimmung'
+    OR message LIKE 'Regel %keine neuen Mails%'
+    OR message LIKE 'Regel %Mail(s) in %prüfen%'
+    OR message LIKE 'Poll gestartet%'
+    OR (message LIKE 'Poll abgeschlossen%' AND message LIKE '%, 0 neu, 0 Treffer, 0 Aktion(en)')
+"""
+
+INDEXES = {
+    "ix_filter_logs_created_at": "(created_at)",
+    "ix_filter_logs_level": "(level)",
+    "ix_filter_logs_account_created": "(account_id, created_at)",
+}
+
+
+def upgrade() -> None:
+    """Tabelle neu aufbauen statt DELETE: nur die relevanten Zeilen kopieren
+    ist bei Millionen Einträgen um ein Vielfaches schneller und erzeugt kein
+    riesiges WAL."""
+    bind = op.get_bind()
+    ddl = bind.execute(
+        text("SELECT sql FROM sqlite_master WHERE type='table' AND name='filter_logs'")
+    ).scalar()
+    if not ddl:
+        return
+    new_ddl = re.sub(r'^CREATE TABLE\s+"?filter_logs"?', 'CREATE TABLE filter_logs_new', ddl, count=1)
+
+    op.execute("DROP TABLE IF EXISTS filter_logs_new")
+    op.execute(new_ddl)
+    op.execute(f"INSERT INTO filter_logs_new SELECT * FROM filter_logs WHERE NOT ({NOISE})")
+    for name in INDEXES:
+        op.execute(f"DROP INDEX IF EXISTS {name}")
+    op.execute("DROP TABLE filter_logs")
+    op.execute("ALTER TABLE filter_logs_new RENAME TO filter_logs")
+    for name, cols in INDEXES.items():
+        op.execute(f"CREATE INDEX {name} ON filter_logs {cols}")
+
+
+def downgrade() -> None:
+    # Gelöschte Routine-Einträge lassen sich nicht wiederherstellen.
+    pass