feat: hold-to-talk + UX fixes + structured prompt overhaul

* feat: add hold-to-talk hotkey mode (closes #1)

OpenLessHotkey now emits explicit .pressed / .released edge events on
the modifier-key trigger; the coordinator interprets them per the new
HotkeyMode preference (toggle stays the default, hold = press-and-hold).

Hold mode rules: .pressed on idle starts the session; .released stops
it from .listening; releasing during .starting cancels (no audio
useful was captured yet). Esc-cancel sets a one-shot suppress flag so
the trailing .released after a cancel does not re-trigger end.

Settings hub gets a "录音方式" segmented picker and a one-line hint
explaining the tradeoff. Bump version to 1.1.0; update README roadmap
and USAGE walkthrough to document the new mode.

* test: update HotkeyEventTests for pressed/released split

* chore: tag hold-to-talk build as 1.0.01 / A1003

* fix: stop window-background drag eating text selection; add eye toggle on secret fields

Settings window had isMovableByWindowBackground = true, so any drag
inside the content view dragged the whole window — making it
impossible to select words inside a TextField. Disable it; the native
title-bar strip (with the traffic lights) still drags the window.

PasteableCredentialField now exposes an eye / eye.slash toggle when
secure: true, so users can verify pasted API keys before saving.

* fix: stop pretending polish ran when it was skipped or errored

When the user removes the Ark API key (or the Ark call errors out),
DictationCoordinator was still showing the green "已插入" capsule and
recording the session in history under the originally-selected polish
mode. From the user's side it looked like polish had succeeded, even
though only the raw transcript reached the cursor.

Track a PolishOutcome (ok / skippedNoCredentials / failed) through
insertText. Capsule now uses a new CapsuleState.warning (orange) state
to surface honest messages — "已插入原文 · 未润色" / "润色失败 · 已用原文" —
and history saves the session as PolishMode.raw whenever polish
didn't actually run. The error capsule + 1.5s artificial sleep that
preceded a fake "success" insert is gone; warning state stays for the
normal 2.5s.

* feat(polish): make Structured mode prompt force a 1./1)/a. hierarchy

Some weaker chat models would emit a single flat list when the user
asked for Structured polish, even when the dictation clearly covered
multiple topics. The mode is meant to produce something pasteable as
an AI prompt or a working doc, not a wall of bullets.

Rewrite the .structured system prompt to be prescriptive: when the
input contains ≥2 themes, emit three explicit levels — top "1./2./3."
sections, "1)/2)/3)" sub-points indented 3 spaces, and "a./b./c."
detail items indented another 3 — and to fall back to a plain
paragraph when the input is short / single-topic. Add a concrete
format example so weaker models have a pattern to copy.

---------

Co-authored-by: baiqing <lbx12309@icloud.com>

scripts/build-app.sh

@@ -6,8 +6,8 @@ cd "$(dirname "$0")/.."
 
 APP_NAME="OpenLess"
 BUNDLE_ID="com.openless.app"
-APP_VERSION="1.0.0"
-BUILD_NUMBER="1"
+APP_VERSION="1.0.01"
+BUILD_NUMBER="A1003"
 BUILD_DIR="build"
 APP_DIR="${BUILD_DIR}/${APP_NAME}.app"
 BIN_DIR="${APP_DIR}/Contents/MacOS"