Syncthing full changelog

Fixes:
Fix(gui): show restarting modal during upgrade restart (fixes #1248) by @steadytao in #10566
Fix(gui): remove width limit for language select items by @EastSun5566 in #10531
Other:
Hore(gui): add id and name to Stay logged in checkbox for password managers by @epifeny in #10558
Chore(db): add ability to wait for programmatically started database maintenance, query last maintenance time by @pixelspark in #10565
Chore(etc): add comprehensive sandboxing by @Valloric in #10421
Chore: build with Go 1.26; use Go 1.25 features by @calmh in #10570

Fixes:
Fix(beacon): skip point-to-point interfaces on Android
Fix(stdiscosrv): use fmt.Println for version output
Fix(stdiscosrv): log full device ID on startup
Other:
Chore(api): remove charset declaration from JSON content-type
Chore(sqlite): allow periodic database maintenance to be disabled
Chore(gui): include license files for fork-awesome assets
Build: add build attestation step at release

Fixes:
Fix(beacon): don't join multicast groups on non-multicast interfaces
Other:
Chore(model): refactor context handling for folder type
Build: fix docker build by ensuring qemu
Chore(beacon): more verbose debug logging
Build: fix hash failure by limiting globbing
Chore: tweak pull retry logic

Fixes:
Fix(beacon): don't join multicast groups on non-multicast interfaces
Other:
Chore(model): refactor context handling for folder type
Build: fix docker build by ensuring qemu
Chore(beacon): more verbose debug logging
Build: fix hash failure by limiting globbing
Chore: tweak pull retry logic

chore: update quic-go, adapt to lack of write tracking by @calmh in #10456
chore(cli): clean up generated usage strings for config commands (fixes #10462) by @acolomb in #10463

Fixes
Fix(policy): only allow approvals by non-author contributors
Fix(fs): store getExpireAdd mutex in caseCache
Fix(fs): apply case option to fakefs in casefs tests
Fix(fs): only apply case option to fakefs in stress test
Other
Docs(docker): make host network mode the default
Chore(upnp): remove incorrect embedding of nat.Service
Chore: minor lint fixes
Chore(gui): add Azerbaijani (az) and Kurdish (ckb) l10n templates.

Fixes:
fix(protocol): avoid deadlock with concurrent connection start and close by @calmh in #10140
fix(syncthing): avoid writing panic log to nil fd by @ardevd in #10154
Features:
feat(config): expose folder and device info as metrics (fixes #9519) by @calmh in #10148
Other:
build: properly propagate build tags to Debian build by @calmh in #10144
chore(protocol): don't start connection routines a second time by @imsodin in #10146
chore(protocol): only allow enc. password changes on cluster config by @imsodin in #10145

Fixes:
fix(db): handle large numbers of blocks in update by @calmh in #10025
fix(syncthing): make directory flags global for all commands by @calmh in #10028
fix(sqlite): apply options by @pixelspark in #10049
fix(db): version vector serialisation :( by @calmh in #10050
fix(model): loop-break regression while block copying in puller by @imsodin in #10069
fix(model): close fd immediately in copier by @imsodin in #10079
fix(model): use same folder first in copier by @imsodin in #10093
fix(model): correct bufferpool handling; simplify by @calmh in #10113
fix(protocol): avoid deadlock with concurrent connection start and close by @calmh in #10140
fix(syncthing): avoid writing panic log to nil fd by @ardevd in #10154
fix(fs): check for unsupported error on modern Windows (fixes #10164) by @rasa in #10165
fix(gui): don't show dial errors for paused devices (fixes #10166) by @marbens-arch in #10167
fix: track invalid files in LocalFlags to fix global count by @imsodin in #10170
fix(watchaggregator): properly handle sub-second watch durations (fixes #9927) by @imsodin in #10179
fix(db): remove invalid member from FileMetadata by @imsodin in #10180
Features:
feat: add syncthing debug database-statistics command by @calmh in #10117
feat(config): enable multiple connections by default by @calmh in #10151
feat(config): expose folder and device info as metrics (fixes #9519) by @calmh in #10148
feat: use Ed25519 keys for sync connections by @calmh in #10162
Other:
chore: remove abandoned next-gen-gui experiment by @calmh in #10004
chore: remove weak hashing which does not pull its weight by @calmh in #10005
chore: switch database engine to sqlite (fixes #9954) by @calmh in #9965
chore: harmonise command line flags by @calmh in #10007
chore(db): increase journal limit to 64MiB by @bt90 in #10022
chore: forget deleted files older than six months (fixes #6284) by @calmh in #10023
chore(db): use shorter read transactions and periodic checkpoint for smaller WAL by @calmh in #10027
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What's Changed:
fix(model): close fd immediately in copier by @imsodin in #10079
build(deps): update dependencies by @calmh in #10091
chore(syncthing): ensure migrated database is closed before exiting by @xjtdy888 in #10076
chore(db, model): simplify per hash DB lookup in copier by @imsodin in #10080
fix(model): use same folder first in copier by @imsodin in #10093
feat(gui): close a modal when pressing ESC after switching modal tabs (fixes #9489) by @hazemKrimi in #10092
chore(model): refactor copier for more flatness by @imsodin in #10094

chore(lib): expose model methods to obtain progress by @pixelspark in #9886
feat(gui): explanation to options enabled or disabled per folder type by @tomasz1986 in #9367
chore: remove abandoned next-gen-gui experiment by @calmh in #10004
chore: remove weak hashing which does not pull its weight by @calmh in #10005
chore: switch database engine to sqlite (fixes #9954) by @calmh in #9965
fix(gui): validate device ID in canonical form (fixes #7291) by @mathias4833 in #10006
fix(config): remove discontinued primary STUN server (fixes #10008) by @marbens-arch in #10009
fix(stun): better error handling (ref #10008) by @calmh in #10010
chore(config): remove discontinued secondary STUN servers (fixes #10011) by @marbens-arch in #10012
chore(fs): speed up case normalization by @bt90 in #10013
chore: harmonise command line flags by @calmh in #10007
build(deps): update dependencies by @calmh in #10020
chore(db): increase journal limit to 64MiB by @bt90 in #10022
chore: forget deleted files older than six months (fixes #6284) by @calmh in #10023
fix(db): handle large numbers of blocks in update by @calmh in #10025
chore(db): use shorter read transactions and periodic checkpoint for smaller WAL by @calmh in #10027
fix(syncthing): make directory flags global for all commands by @calmh in #10028
chore: configurable delete retention interval by @calmh in #10030
feat(fs, config): add support for custom filesystem type construction by @pixelspark in #9887
build: replace underscore in Debian version by @bt90 in #10032
chore(db): fix debug logging by @bt90 in #10033
chore(db): buffer pulled files for smaller WAL by @calmh in #10036
chore(model): add metric for total number of conflicts by @swenske in #10037
fix(config): properly apply defaults when reading folder configuration by @pixelspark in #10034
fix(config): zero filesystemtype is "basic" by @calmh in #10038
chore(db): use one SQLite database per folder by @calmh in #10042
chore(model): delay starting a pull while there